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Finding the Fourth Proportional to 1,017.38, 1,403.52 and 685.91

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Solution

The fourth proportional to 1,017.38, 1,403.52 and 685.91 is: 946.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,017.38 : 1,403.52 = 685.91 : x
  2. Step 2: Convert to fraction form
    1,017.38/1,403.52 = 685.91/x
  3. Step 3: Cross multiply
    1,017.38x = 1,403.52 × 685.91
  4. Step 4: Simplify right side
    1,017.38x = 962,688.40
  5. Step 5: Solve for x
    x = 962,688.40/1,017.38
  6. Step 6: Final answer
    x = 946.24

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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.