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Finding the Fourth Proportional to 86,711.40, 130,091.40 and 42,339.60

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Solution

The fourth proportional to 86,711.40, 130,091.40 and 42,339.60 is: 63,521.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,711.40 : 130,091.40 = 42,339.60 : x
  2. Step 2: Convert to fraction form
    86,711.40/130,091.40 = 42,339.60/x
  3. Step 3: Cross multiply
    86,711.40x = 130,091.40 × 42,339.60
  4. Step 4: Simplify right side
    86,711.40x = 5,508,017,839.44
  5. Step 5: Solve for x
    x = 5,508,017,839.44/86,711.40
  6. Step 6: Final answer
    x = 63,521.27

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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.