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Finding the Fourth Proportional to 1,387.62, 2,079.81 and 616.50

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Solution

The fourth proportional to 1,387.62, 2,079.81 and 616.50 is: 924.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.62 : 2,079.81 = 616.50 : x
  2. Step 2: Convert to fraction form
    1,387.62/2,079.81 = 616.50/x
  3. Step 3: Cross multiply
    1,387.62x = 2,079.81 × 616.50
  4. Step 4: Simplify right side
    1,387.62x = 1,282,202.87
  5. Step 5: Solve for x
    x = 1,282,202.87/1,387.62
  6. Step 6: Final answer
    x = 924.03

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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.