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Finding the Fourth Proportional to 129,987.20, 194,980.80 and 79,904.90

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Solution

The fourth proportional to 129,987.20, 194,980.80 and 79,904.90 is: 119,857.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,987.20 : 194,980.80 = 79,904.90 : x
  2. Step 2: Convert to fraction form
    129,987.20/194,980.80 = 79,904.90/x
  3. Step 3: Cross multiply
    129,987.20x = 194,980.80 × 79,904.90
  4. Step 4: Simplify right side
    129,987.20x = 15,579,921,325.92
  5. Step 5: Solve for x
    x = 15,579,921,325.92/129,987.20
  6. Step 6: Final answer
    x = 119,857.35

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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.