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Finding the Fourth Proportional to 86,904.80, 130,162.80 and 75,240.80

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Solution

The fourth proportional to 86,904.80, 130,162.80 and 75,240.80 is: 112,692.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,904.80 : 130,162.80 = 75,240.80 : x
  2. Step 2: Convert to fraction form
    86,904.80/130,162.80 = 75,240.80/x
  3. Step 3: Cross multiply
    86,904.80x = 130,162.80 × 75,240.80
  4. Step 4: Simplify right side
    86,904.80x = 9,793,553,202.24
  5. Step 5: Solve for x
    x = 9,793,553,202.24/86,904.80
  6. Step 6: Final answer
    x = 112,692.89

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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.