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Finding the Fourth Proportional to 1,871.04, 2,805.62 and 638.01

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Solution

The fourth proportional to 1,871.04, 2,805.62 and 638.01 is: 956.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.04 : 2,805.62 = 638.01 : x
  2. Step 2: Convert to fraction form
    1,871.04/2,805.62 = 638.01/x
  3. Step 3: Cross multiply
    1,871.04x = 2,805.62 × 638.01
  4. Step 4: Simplify right side
    1,871.04x = 1,790,010.43
  5. Step 5: Solve for x
    x = 1,790,010.43/1,871.04
  6. Step 6: Final answer
    x = 956.70

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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.