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Finding the Fourth Proportional to 929.17, 1,280.49 and 666.73

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Solution

The fourth proportional to 929.17, 1,280.49 and 666.73 is: 918.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.17 : 1,280.49 = 666.73 : x
  2. Step 2: Convert to fraction form
    929.17/1,280.49 = 666.73/x
  3. Step 3: Cross multiply
    929.17x = 1,280.49 × 666.73
  4. Step 4: Simplify right side
    929.17x = 853,741.10
  5. Step 5: Solve for x
    x = 853,741.10/929.17
  6. Step 6: Final answer
    x = 918.82

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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.