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Finding the Fourth Proportional to 129,434.69, 178,674.98 and 87,017.82

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Solution

The fourth proportional to 129,434.69, 178,674.98 and 87,017.82 is: 120,121.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,434.69 : 178,674.98 = 87,017.82 : x
  2. Step 2: Convert to fraction form
    129,434.69/178,674.98 = 87,017.82/x
  3. Step 3: Cross multiply
    129,434.69x = 178,674.98 × 87,017.82
  4. Step 4: Simplify right side
    129,434.69x = 15,547,906,813.05
  5. Step 5: Solve for x
    x = 15,547,906,813.05/129,434.69
  6. Step 6: Final answer
    x = 120,121.64

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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.