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Finding the Fourth Proportional to 2,491.68, 3,737.72 and 642.79

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Solution

The fourth proportional to 2,491.68, 3,737.72 and 642.79 is: 964.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,491.68 : 3,737.72 = 642.79 : x
  2. Step 2: Convert to fraction form
    2,491.68/3,737.72 = 642.79/x
  3. Step 3: Cross multiply
    2,491.68x = 3,737.72 × 642.79
  4. Step 4: Simplify right side
    2,491.68x = 2,402,569.04
  5. Step 5: Solve for x
    x = 2,402,569.04/2,491.68
  6. Step 6: Final answer
    x = 964.24

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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.