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Finding the Fourth Proportional to 929.78, 1,394.62 and 517.65

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Solution

The fourth proportional to 929.78, 1,394.62 and 517.65 is: 776.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.78 : 1,394.62 = 517.65 : x
  2. Step 2: Convert to fraction form
    929.78/1,394.62 = 517.65/x
  3. Step 3: Cross multiply
    929.78x = 1,394.62 × 517.65
  4. Step 4: Simplify right side
    929.78x = 721,925.04
  5. Step 5: Solve for x
    x = 721,925.04/929.78
  6. Step 6: Final answer
    x = 776.45

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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.