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Finding the Fourth Proportional to 1,440.76, 1,988.40 and 851.35

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Solution

The fourth proportional to 1,440.76, 1,988.40 and 851.35 is: 1,174.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.76 : 1,988.40 = 851.35 : x
  2. Step 2: Convert to fraction form
    1,440.76/1,988.40 = 851.35/x
  3. Step 3: Cross multiply
    1,440.76x = 1,988.40 × 851.35
  4. Step 4: Simplify right side
    1,440.76x = 1,692,824.34
  5. Step 5: Solve for x
    x = 1,692,824.34/1,440.76
  6. Step 6: Final answer
    x = 1,174.95

Related Problems

Find fourth proportional to 720.38, 994.20 and 425.68
Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.