Home / 129,971.21-179,372.33-78,972.18

Finding the Fourth Proportional to 129,971.21, 179,372.33 and 78,972.18

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Solution

The fourth proportional to 129,971.21, 179,372.33 and 78,972.18 is: 108,988.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,971.21 : 179,372.33 = 78,972.18 : x
  2. Step 2: Convert to fraction form
    129,971.21/179,372.33 = 78,972.18/x
  3. Step 3: Cross multiply
    129,971.21x = 179,372.33 × 78,972.18
  4. Step 4: Simplify right side
    129,971.21x = 14,165,423,536.92
  5. Step 5: Solve for x
    x = 14,165,423,536.92/129,971.21
  6. Step 6: Final answer
    x = 108,988.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.