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Finding the Fourth Proportional to 1,871.74, 2,807.61 and 638.52

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Solution

The fourth proportional to 1,871.74, 2,807.61 and 638.52 is: 957.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.74 : 2,807.61 = 638.52 : x
  2. Step 2: Convert to fraction form
    1,871.74/2,807.61 = 638.52/x
  3. Step 3: Cross multiply
    1,871.74x = 2,807.61 × 638.52
  4. Step 4: Simplify right side
    1,871.74x = 1,792,715.14
  5. Step 5: Solve for x
    x = 1,792,715.14/1,871.74
  6. Step 6: Final answer
    x = 957.78

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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.