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Finding the Fourth Proportional to 922.68, 1,272.90 and 572.76

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Solution

The fourth proportional to 922.68, 1,272.90 and 572.76 is: 790.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.68 : 1,272.90 = 572.76 : x
  2. Step 2: Convert to fraction form
    922.68/1,272.90 = 572.76/x
  3. Step 3: Cross multiply
    922.68x = 1,272.90 × 572.76
  4. Step 4: Simplify right side
    922.68x = 729,066.20
  5. Step 5: Solve for x
    x = 729,066.20/922.68
  6. Step 6: Final answer
    x = 790.16

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Double scale
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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.