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Finding the Fourth Proportional to 86,909.80, 130,134.30 and 68,477.80

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Solution

The fourth proportional to 86,909.80, 130,134.30 and 68,477.80 is: 102,535.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,909.80 : 130,134.30 = 68,477.80 : x
  2. Step 2: Convert to fraction form
    86,909.80/130,134.30 = 68,477.80/x
  3. Step 3: Cross multiply
    86,909.80x = 130,134.30 × 68,477.80
  4. Step 4: Simplify right side
    86,909.80x = 8,911,310,568.54
  5. Step 5: Solve for x
    x = 8,911,310,568.54/86,909.80
  6. Step 6: Final answer
    x = 102,535.16

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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.