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Finding the Fourth Proportional to 99,686.80, 149,611.80 and 98,909.20

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Solution

The fourth proportional to 99,686.80, 149,611.80 and 98,909.20 is: 148,444.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,686.80 : 149,611.80 = 98,909.20 : x
  2. Step 2: Convert to fraction form
    99,686.80/149,611.80 = 98,909.20/x
  3. Step 3: Cross multiply
    99,686.80x = 149,611.80 × 98,909.20
  4. Step 4: Simplify right side
    99,686.80x = 14,797,983,448.56
  5. Step 5: Solve for x
    x = 14,797,983,448.56/99,686.80
  6. Step 6: Final answer
    x = 148,444.76

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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.