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Finding the Fourth Proportional to 1,587.31, 2,381.00 and 433.06

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Solution

The fourth proportional to 1,587.31, 2,381.00 and 433.06 is: 649.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.31 : 2,381.00 = 433.06 : x
  2. Step 2: Convert to fraction form
    1,587.31/2,381.00 = 433.06/x
  3. Step 3: Cross multiply
    1,587.31x = 2,381.00 × 433.06
  4. Step 4: Simplify right side
    1,587.31x = 1,031,107.74
  5. Step 5: Solve for x
    x = 1,031,107.74/1,587.31
  6. Step 6: Final answer
    x = 649.60

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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.