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Finding the Fourth Proportional to 86,312.80, 129,490.80 and 68,610.40

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Solution

The fourth proportional to 86,312.80, 129,490.80 and 68,610.40 is: 102,932.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,312.80 : 129,490.80 = 68,610.40 : x
  2. Step 2: Convert to fraction form
    86,312.80/129,490.80 = 68,610.40/x
  3. Step 3: Cross multiply
    86,312.80x = 129,490.80 × 68,610.40
  4. Step 4: Simplify right side
    86,312.80x = 8,884,415,584.32
  5. Step 5: Solve for x
    x = 8,884,415,584.32/86,312.80
  6. Step 6: Final answer
    x = 102,932.77

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1.5x scale

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.