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Finding the Fourth Proportional to 120,121.40, 179,922.90 and 99,385.40

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Solution

The fourth proportional to 120,121.40, 179,922.90 and 99,385.40 is: 148,863.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,121.40 : 179,922.90 = 99,385.40 : x
  2. Step 2: Convert to fraction form
    120,121.40/179,922.90 = 99,385.40/x
  3. Step 3: Cross multiply
    120,121.40x = 179,922.90 × 99,385.40
  4. Step 4: Simplify right side
    120,121.40x = 17,881,709,385.66
  5. Step 5: Solve for x
    x = 17,881,709,385.66/120,121.40
  6. Step 6: Final answer
    x = 148,863.64

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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.