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Finding the Fourth Proportional to 986.76, 1,480.13 and 256.34

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Solution

The fourth proportional to 986.76, 1,480.13 and 256.34 is: 384.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.76 : 1,480.13 = 256.34 : x
  2. Step 2: Convert to fraction form
    986.76/1,480.13 = 256.34/x
  3. Step 3: Cross multiply
    986.76x = 1,480.13 × 256.34
  4. Step 4: Simplify right side
    986.76x = 379,416.52
  5. Step 5: Solve for x
    x = 379,416.52/986.76
  6. Step 6: Final answer
    x = 384.51

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.