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Finding the Fourth Proportional to 18,987.60, 28,513.80 and 10,239.60

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Solution

The fourth proportional to 18,987.60, 28,513.80 and 10,239.60 is: 15,376.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.60 : 28,513.80 = 10,239.60 : x
  2. Step 2: Convert to fraction form
    18,987.60/28,513.80 = 10,239.60/x
  3. Step 3: Cross multiply
    18,987.60x = 28,513.80 × 10,239.60
  4. Step 4: Simplify right side
    18,987.60x = 291,969,906.48
  5. Step 5: Solve for x
    x = 291,969,906.48/18,987.60
  6. Step 6: Final answer
    x = 15,376.87

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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.