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Finding the Fourth Proportional to 15,239.80, 20,987.04 and 12,562.60

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Solution

The fourth proportional to 15,239.80, 20,987.04 and 12,562.60 is: 17,300.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,239.80 : 20,987.04 = 12,562.60 : x
  2. Step 2: Convert to fraction form
    15,239.80/20,987.04 = 12,562.60/x
  3. Step 3: Cross multiply
    15,239.80x = 20,987.04 × 12,562.60
  4. Step 4: Simplify right side
    15,239.80x = 263,651,788.70
  5. Step 5: Solve for x
    x = 263,651,788.70/15,239.80
  6. Step 6: Final answer
    x = 17,300.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.