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Finding the Fourth Proportional to 741.28, 1,108.74 and 432.36

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Solution

The fourth proportional to 741.28, 1,108.74 and 432.36 is: 646.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.28 : 1,108.74 = 432.36 : x
  2. Step 2: Convert to fraction form
    741.28/1,108.74 = 432.36/x
  3. Step 3: Cross multiply
    741.28x = 1,108.74 × 432.36
  4. Step 4: Simplify right side
    741.28x = 479,374.83
  5. Step 5: Solve for x
    x = 479,374.83/741.28
  6. Step 6: Final answer
    x = 646.69

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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.