Home / 129,510.23-178,676.70-78,486.15

Finding the Fourth Proportional to 129,510.23, 178,676.70 and 78,486.15

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Solution

The fourth proportional to 129,510.23, 178,676.70 and 78,486.15 is: 108,282.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,510.23 : 178,676.70 = 78,486.15 : x
  2. Step 2: Convert to fraction form
    129,510.23/178,676.70 = 78,486.15/x
  3. Step 3: Cross multiply
    129,510.23x = 178,676.70 × 78,486.15
  4. Step 4: Simplify right side
    129,510.23x = 14,023,646,277.71
  5. Step 5: Solve for x
    x = 14,023,646,277.71/129,510.23
  6. Step 6: Final answer
    x = 108,282.15

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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.