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Finding the Fourth Proportional to 930.57, 1,284.19 and 557.87

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Solution

The fourth proportional to 930.57, 1,284.19 and 557.87 is: 769.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.57 : 1,284.19 = 557.87 : x
  2. Step 2: Convert to fraction form
    930.57/1,284.19 = 557.87/x
  3. Step 3: Cross multiply
    930.57x = 1,284.19 × 557.87
  4. Step 4: Simplify right side
    930.57x = 716,403.26
  5. Step 5: Solve for x
    x = 716,403.26/930.57
  6. Step 6: Final answer
    x = 769.85

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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.