Home / 129,309.10-193,711.45-72,978.81

Finding the Fourth Proportional to 129,309.10, 193,711.45 and 72,978.81

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Solution

The fourth proportional to 129,309.10, 193,711.45 and 72,978.81 is: 109,325.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,309.10 : 193,711.45 = 72,978.81 : x
  2. Step 2: Convert to fraction form
    129,309.10/193,711.45 = 72,978.81/x
  3. Step 3: Cross multiply
    129,309.10x = 193,711.45 × 72,978.81
  4. Step 4: Simplify right side
    129,309.10x = 14,136,831,104.37
  5. Step 5: Solve for x
    x = 14,136,831,104.37/129,309.10
  6. Step 6: Final answer
    x = 109,325.88

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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.