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Finding the Fourth Proportional to 981.34, 1,471.40 and 433.78

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Solution

The fourth proportional to 981.34, 1,471.40 and 433.78 is: 650.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.34 : 1,471.40 = 433.78 : x
  2. Step 2: Convert to fraction form
    981.34/1,471.40 = 433.78/x
  3. Step 3: Cross multiply
    981.34x = 1,471.40 × 433.78
  4. Step 4: Simplify right side
    981.34x = 638,263.89
  5. Step 5: Solve for x
    x = 638,263.89/981.34
  6. Step 6: Final answer
    x = 650.40

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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.