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Finding the Fourth Proportional to 21,987.60, 32,932.80 and 11,587.20

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Solution

The fourth proportional to 21,987.60, 32,932.80 and 11,587.20 is: 17,355.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.60 : 32,932.80 = 11,587.20 : x
  2. Step 2: Convert to fraction form
    21,987.60/32,932.80 = 11,587.20/x
  3. Step 3: Cross multiply
    21,987.60x = 32,932.80 × 11,587.20
  4. Step 4: Simplify right side
    21,987.60x = 381,598,940.16
  5. Step 5: Solve for x
    x = 381,598,940.16/21,987.60
  6. Step 6: Final answer
    x = 17,355.19

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1.5x scale

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.