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Finding the Fourth Proportional to 86,963.60, 130,531.80 and 42,640.40

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Solution

The fourth proportional to 86,963.60, 130,531.80 and 42,640.40 is: 64,002.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,963.60 : 130,531.80 = 42,640.40 : x
  2. Step 2: Convert to fraction form
    86,963.60/130,531.80 = 42,640.40/x
  3. Step 3: Cross multiply
    86,963.60x = 130,531.80 × 42,640.40
  4. Step 4: Simplify right side
    86,963.60x = 5,565,928,164.72
  5. Step 5: Solve for x
    x = 5,565,928,164.72/86,963.60
  6. Step 6: Final answer
    x = 64,002.96

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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.