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Finding the Fourth Proportional to 86,816.80, 130,030.80 and 67,031.20

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Solution

The fourth proportional to 86,816.80, 130,030.80 and 67,031.20 is: 100,396.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,816.80 : 130,030.80 = 67,031.20 : x
  2. Step 2: Convert to fraction form
    86,816.80/130,030.80 = 67,031.20/x
  3. Step 3: Cross multiply
    86,816.80x = 130,030.80 × 67,031.20
  4. Step 4: Simplify right side
    86,816.80x = 8,716,120,560.96
  5. Step 5: Solve for x
    x = 8,716,120,560.96/86,816.80
  6. Step 6: Final answer
    x = 100,396.70

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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.