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Finding the Fourth Proportional to 924.90, 1,390.56 and 743.55

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Solution

The fourth proportional to 924.90, 1,390.56 and 743.55 is: 1,117.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.90 : 1,390.56 = 743.55 : x
  2. Step 2: Convert to fraction form
    924.90/1,390.56 = 743.55/x
  3. Step 3: Cross multiply
    924.90x = 1,390.56 × 743.55
  4. Step 4: Simplify right side
    924.90x = 1,033,950.89
  5. Step 5: Solve for x
    x = 1,033,950.89/924.90
  6. Step 6: Final answer
    x = 1,117.91

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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.