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Finding the Fourth Proportional to 930.61, 1,284.57 and 557.71

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Solution

The fourth proportional to 930.61, 1,284.57 and 557.71 is: 769.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.61 : 1,284.57 = 557.71 : x
  2. Step 2: Convert to fraction form
    930.61/1,284.57 = 557.71/x
  3. Step 3: Cross multiply
    930.61x = 1,284.57 × 557.71
  4. Step 4: Simplify right side
    930.61x = 716,417.53
  5. Step 5: Solve for x
    x = 716,417.53/930.61
  6. Step 6: Final answer
    x = 769.84

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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.