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Finding the Fourth Proportional to 920.57, 1,380.65 and 529.74

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Solution

The fourth proportional to 920.57, 1,380.65 and 529.74 is: 794.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.57 : 1,380.65 = 529.74 : x
  2. Step 2: Convert to fraction form
    920.57/1,380.65 = 529.74/x
  3. Step 3: Cross multiply
    920.57x = 1,380.65 × 529.74
  4. Step 4: Simplify right side
    920.57x = 731,382.88
  5. Step 5: Solve for x
    x = 731,382.88/920.57
  6. Step 6: Final answer
    x = 794.49

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.