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Finding the Fourth Proportional to 929.61, 1,391.99 and 743.65

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Solution

The fourth proportional to 929.61, 1,391.99 and 743.65 is: 1,113.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.61 : 1,391.99 = 743.65 : x
  2. Step 2: Convert to fraction form
    929.61/1,391.99 = 743.65/x
  3. Step 3: Cross multiply
    929.61x = 1,391.99 × 743.65
  4. Step 4: Simplify right side
    929.61x = 1,035,146.17
  5. Step 5: Solve for x
    x = 1,035,146.17/929.61
  6. Step 6: Final answer
    x = 1,113.53

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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.