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Finding the Fourth Proportional to 86,448, 129,672 and 28,080

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Solution

The fourth proportional to 86,448, 129,672 and 28,080 is: 42,120

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,448 : 129,672 = 28,080 : x
  2. Step 2: Convert to fraction form
    86,448/129,672 = 28,080/x
  3. Step 3: Cross multiply
    86,448x = 129,672 × 28,080
  4. Step 4: Simplify right side
    86,448x = 3,641,189,760
  5. Step 5: Solve for x
    x = 3,641,189,760/86,448
  6. Step 6: Final answer
    x = 42,120

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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.