Home / 1,587.20-2,381.20-491.57

Finding the Fourth Proportional to 1,587.20, 2,381.20 and 491.57

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Solution

The fourth proportional to 1,587.20, 2,381.20 and 491.57 is: 737.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.20 : 2,381.20 = 491.57 : x
  2. Step 2: Convert to fraction form
    1,587.20/2,381.20 = 491.57/x
  3. Step 3: Cross multiply
    1,587.20x = 2,381.20 × 491.57
  4. Step 4: Simplify right side
    1,587.20x = 1,170,522.28
  5. Step 5: Solve for x
    x = 1,170,522.28/1,587.20
  6. Step 6: Final answer
    x = 737.48

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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.