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Finding the Fourth Proportional to 78,901.84, 108,812.42 and 61,676.50

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Solution

The fourth proportional to 78,901.84, 108,812.42 and 61,676.50 is: 85,057.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,901.84 : 108,812.42 = 61,676.50 : x
  2. Step 2: Convert to fraction form
    78,901.84/108,812.42 = 61,676.50/x
  3. Step 3: Cross multiply
    78,901.84x = 108,812.42 × 61,676.50
  4. Step 4: Simplify right side
    78,901.84x = 6,711,169,222.13
  5. Step 5: Solve for x
    x = 6,711,169,222.13/78,901.84
  6. Step 6: Final answer
    x = 85,057.20

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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.