Home / 1,587.12-2,381.20-491.60

Finding the Fourth Proportional to 1,587.12, 2,381.20 and 491.60

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Solution

The fourth proportional to 1,587.12, 2,381.20 and 491.60 is: 737.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.12 : 2,381.20 = 491.60 : x
  2. Step 2: Convert to fraction form
    1,587.12/2,381.20 = 491.60/x
  3. Step 3: Cross multiply
    1,587.12x = 2,381.20 × 491.60
  4. Step 4: Simplify right side
    1,587.12x = 1,170,597.92
  5. Step 5: Solve for x
    x = 1,170,597.92/1,587.12
  6. Step 6: Final answer
    x = 737.56

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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.