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Finding the Fourth Proportional to 138,526.50, 191,166.62 and 78,910.50

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Solution

The fourth proportional to 138,526.50, 191,166.62 and 78,910.50 is: 108,896.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,526.50 : 191,166.62 = 78,910.50 : x
  2. Step 2: Convert to fraction form
    138,526.50/191,166.62 = 78,910.50/x
  3. Step 3: Cross multiply
    138,526.50x = 191,166.62 × 78,910.50
  4. Step 4: Simplify right side
    138,526.50x = 15,085,053,172.96
  5. Step 5: Solve for x
    x = 15,085,053,172.96/138,526.50
  6. Step 6: Final answer
    x = 108,896.52

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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.