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Finding the Fourth Proportional to 9,987.20, 14,978.70 and 5,052.20

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Solution

The fourth proportional to 9,987.20, 14,978.70 and 5,052.20 is: 7,577.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,987.20 : 14,978.70 = 5,052.20 : x
  2. Step 2: Convert to fraction form
    9,987.20/14,978.70 = 5,052.20/x
  3. Step 3: Cross multiply
    9,987.20x = 14,978.70 × 5,052.20
  4. Step 4: Simplify right side
    9,987.20x = 75,675,388.14
  5. Step 5: Solve for x
    x = 75,675,388.14/9,987.20
  6. Step 6: Final answer
    x = 7,577.24

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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.