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Finding the Fourth Proportional to 15,999.20, 23,978.40 and 8,979.20

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Solution

The fourth proportional to 15,999.20, 23,978.40 and 8,979.20 is: 13,457.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,999.20 : 23,978.40 = 8,979.20 : x
  2. Step 2: Convert to fraction form
    15,999.20/23,978.40 = 8,979.20/x
  3. Step 3: Cross multiply
    15,999.20x = 23,978.40 × 8,979.20
  4. Step 4: Simplify right side
    15,999.20x = 215,306,849.28
  5. Step 5: Solve for x
    x = 215,306,849.28/15,999.20
  6. Step 6: Final answer
    x = 13,457.35

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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.