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Finding the Fourth Proportional to 1,572.76, 2,170.47 and 909.64

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Solution

The fourth proportional to 1,572.76, 2,170.47 and 909.64 is: 1,255.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.76 : 2,170.47 = 909.64 : x
  2. Step 2: Convert to fraction form
    1,572.76/2,170.47 = 909.64/x
  3. Step 3: Cross multiply
    1,572.76x = 2,170.47 × 909.64
  4. Step 4: Simplify right side
    1,572.76x = 1,974,346.33
  5. Step 5: Solve for x
    x = 1,974,346.33/1,572.76
  6. Step 6: Final answer
    x = 1,255.34

Related Problems

Find fourth proportional to 786.38, 1,085.24 and 454.82
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Double scale
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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.