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Finding the Fourth Proportional to 1,017.63, 1,404.54 and 686.61

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Solution

The fourth proportional to 1,017.63, 1,404.54 and 686.61 is: 947.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,017.63 : 1,404.54 = 686.61 : x
  2. Step 2: Convert to fraction form
    1,017.63/1,404.54 = 686.61/x
  3. Step 3: Cross multiply
    1,017.63x = 1,404.54 × 686.61
  4. Step 4: Simplify right side
    1,017.63x = 964,371.21
  5. Step 5: Solve for x
    x = 964,371.21/1,017.63
  6. Step 6: Final answer
    x = 947.66

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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.