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Finding the Fourth Proportional to 930.62, 1,284.04 and 557.53

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Solution

The fourth proportional to 930.62, 1,284.04 and 557.53 is: 769.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.62 : 1,284.04 = 557.53 : x
  2. Step 2: Convert to fraction form
    930.62/1,284.04 = 557.53/x
  3. Step 3: Cross multiply
    930.62x = 1,284.04 × 557.53
  4. Step 4: Simplify right side
    930.62x = 715,890.82
  5. Step 5: Solve for x
    x = 715,890.82/930.62
  6. Step 6: Final answer
    x = 769.26

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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.