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Finding the Fourth Proportional to 1,017.28, 1,403.80 and 624.24

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Solution

The fourth proportional to 1,017.28, 1,403.80 and 624.24 is: 861.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,017.28 : 1,403.80 = 624.24 : x
  2. Step 2: Convert to fraction form
    1,017.28/1,403.80 = 624.24/x
  3. Step 3: Cross multiply
    1,017.28x = 1,403.80 × 624.24
  4. Step 4: Simplify right side
    1,017.28x = 876,308.11
  5. Step 5: Solve for x
    x = 876,308.11/1,017.28
  6. Step 6: Final answer
    x = 861.42

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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.