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Finding the Fourth Proportional to 930.60, 1,284.56 and 557.70

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Solution

The fourth proportional to 930.60, 1,284.56 and 557.70 is: 769.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.60 : 1,284.56 = 557.70 : x
  2. Step 2: Convert to fraction form
    930.60/1,284.56 = 557.70/x
  3. Step 3: Cross multiply
    930.60x = 1,284.56 × 557.70
  4. Step 4: Simplify right side
    930.60x = 716,399.11
  5. Step 5: Solve for x
    x = 716,399.11/930.60
  6. Step 6: Final answer
    x = 769.82

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1.5x scale

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.