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Finding the Fourth Proportional to 1,587.80, 2,381.70 and 663.29

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Solution

The fourth proportional to 1,587.80, 2,381.70 and 663.29 is: 994.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.80 : 2,381.70 = 663.29 : x
  2. Step 2: Convert to fraction form
    1,587.80/2,381.70 = 663.29/x
  3. Step 3: Cross multiply
    1,587.80x = 2,381.70 × 663.29
  4. Step 4: Simplify right side
    1,587.80x = 1,579,757.30
  5. Step 5: Solve for x
    x = 1,579,757.30/1,587.80
  6. Step 6: Final answer
    x = 994.93

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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.