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Finding the Fourth Proportional to 981.36, 1,472.16 and 433.44

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Solution

The fourth proportional to 981.36, 1,472.16 and 433.44 is: 650.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.36 : 1,472.16 = 433.44 : x
  2. Step 2: Convert to fraction form
    981.36/1,472.16 = 433.44/x
  3. Step 3: Cross multiply
    981.36x = 1,472.16 × 433.44
  4. Step 4: Simplify right side
    981.36x = 638,093.03
  5. Step 5: Solve for x
    x = 638,093.03/981.36
  6. Step 6: Final answer
    x = 650.21

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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.