Home / 129,114.78-178,167.51-78,804.06

Finding the Fourth Proportional to 129,114.78, 178,167.51 and 78,804.06

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Solution

The fourth proportional to 129,114.78, 178,167.51 and 78,804.06 is: 108,742.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,114.78 : 178,167.51 = 78,804.06 : x
  2. Step 2: Convert to fraction form
    129,114.78/178,167.51 = 78,804.06/x
  3. Step 3: Cross multiply
    129,114.78x = 178,167.51 × 78,804.06
  4. Step 4: Simplify right side
    129,114.78x = 14,040,323,148.09
  5. Step 5: Solve for x
    x = 14,040,323,148.09/129,114.78
  6. Step 6: Final answer
    x = 108,742.96

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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.