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Finding the Fourth Proportional to 19,987.60, 29,932.80 and 9,587.20

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Solution

The fourth proportional to 19,987.60, 29,932.80 and 9,587.20 is: 14,357.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,987.60 : 29,932.80 = 9,587.20 : x
  2. Step 2: Convert to fraction form
    19,987.60/29,932.80 = 9,587.20/x
  3. Step 3: Cross multiply
    19,987.60x = 29,932.80 × 9,587.20
  4. Step 4: Simplify right side
    19,987.60x = 286,971,740.16
  5. Step 5: Solve for x
    x = 286,971,740.16/19,987.60
  6. Step 6: Final answer
    x = 14,357.49

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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.