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Finding the Fourth Proportional to 86,827.20, 130,240.80 and 42,460.80

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Solution

The fourth proportional to 86,827.20, 130,240.80 and 42,460.80 is: 63,691.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,827.20 : 130,240.80 = 42,460.80 : x
  2. Step 2: Convert to fraction form
    86,827.20/130,240.80 = 42,460.80/x
  3. Step 3: Cross multiply
    86,827.20x = 130,240.80 × 42,460.80
  4. Step 4: Simplify right side
    86,827.20x = 5,530,128,560.64
  5. Step 5: Solve for x
    x = 5,530,128,560.64/86,827.20
  6. Step 6: Final answer
    x = 63,691.20

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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.