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Finding the Fourth Proportional to 2,491.87, 3,737.90 and 931.71

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Solution

The fourth proportional to 2,491.87, 3,737.90 and 931.71 is: 1,397.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,491.87 : 3,737.90 = 931.71 : x
  2. Step 2: Convert to fraction form
    2,491.87/3,737.90 = 931.71/x
  3. Step 3: Cross multiply
    2,491.87x = 3,737.90 × 931.71
  4. Step 4: Simplify right side
    2,491.87x = 3,482,638.81
  5. Step 5: Solve for x
    x = 3,482,638.81/2,491.87
  6. Step 6: Final answer
    x = 1,397.60

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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.