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Finding the Fourth Proportional to 1,587.90, 2,381.94 and 492.42

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Solution

The fourth proportional to 1,587.90, 2,381.94 and 492.42 is: 738.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.90 : 2,381.94 = 492.42 : x
  2. Step 2: Convert to fraction form
    1,587.90/2,381.94 = 492.42/x
  3. Step 3: Cross multiply
    1,587.90x = 2,381.94 × 492.42
  4. Step 4: Simplify right side
    1,587.90x = 1,172,914.89
  5. Step 5: Solve for x
    x = 1,172,914.89/1,587.90
  6. Step 6: Final answer
    x = 738.66

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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.