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Finding the Fourth Proportional to 138,402.50, 190,995.45 and 74,740.30

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Solution

The fourth proportional to 138,402.50, 190,995.45 and 74,740.30 is: 103,141.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,402.50 : 190,995.45 = 74,740.30 : x
  2. Step 2: Convert to fraction form
    138,402.50/190,995.45 = 74,740.30/x
  3. Step 3: Cross multiply
    138,402.50x = 190,995.45 × 74,740.30
  4. Step 4: Simplify right side
    138,402.50x = 14,275,056,922.02
  5. Step 5: Solve for x
    x = 14,275,056,922.02/138,402.50
  6. Step 6: Final answer
    x = 103,141.61

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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.