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Finding the Fourth Proportional to 981.24, 1,354.17 and 686.58

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Solution

The fourth proportional to 981.24, 1,354.17 and 686.58 is: 947.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.24 : 1,354.17 = 686.58 : x
  2. Step 2: Convert to fraction form
    981.24/1,354.17 = 686.58/x
  3. Step 3: Cross multiply
    981.24x = 1,354.17 × 686.58
  4. Step 4: Simplify right side
    981.24x = 929,746.04
  5. Step 5: Solve for x
    x = 929,746.04/981.24
  6. Step 6: Final answer
    x = 947.52

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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.