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Finding the Fourth Proportional to 86,691.60, 130,069.80 and 34,137.72

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Solution

The fourth proportional to 86,691.60, 130,069.80 and 34,137.72 is: 51,219.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,691.60 : 130,069.80 = 34,137.72 : x
  2. Step 2: Convert to fraction form
    86,691.60/130,069.80 = 34,137.72/x
  3. Step 3: Cross multiply
    86,691.60x = 130,069.80 × 34,137.72
  4. Step 4: Simplify right side
    86,691.60x = 4,440,286,412.86
  5. Step 5: Solve for x
    x = 4,440,286,412.86/86,691.60
  6. Step 6: Final answer
    x = 51,219.34

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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.