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Finding the Fourth Proportional to 1,387.53, 2,081.30 and 414.32

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Solution

The fourth proportional to 1,387.53, 2,081.30 and 414.32 is: 621.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.53 : 2,081.30 = 414.32 : x
  2. Step 2: Convert to fraction form
    1,387.53/2,081.30 = 414.32/x
  3. Step 3: Cross multiply
    1,387.53x = 2,081.30 × 414.32
  4. Step 4: Simplify right side
    1,387.53x = 862,311.74
  5. Step 5: Solve for x
    x = 862,311.74/1,387.53
  6. Step 6: Final answer
    x = 621.47

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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.