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Finding the Fourth Proportional to 84,013.80, 126,020.70 and 78,829.80

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Solution

The fourth proportional to 84,013.80, 126,020.70 and 78,829.80 is: 118,244.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,013.80 : 126,020.70 = 78,829.80 : x
  2. Step 2: Convert to fraction form
    84,013.80/126,020.70 = 78,829.80/x
  3. Step 3: Cross multiply
    84,013.80x = 126,020.70 × 78,829.80
  4. Step 4: Simplify right side
    84,013.80x = 9,934,186,576.86
  5. Step 5: Solve for x
    x = 9,934,186,576.86/84,013.80
  6. Step 6: Final answer
    x = 118,244.70

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1.5x scale

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.