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Finding the Fourth Proportional to 138,362.32, 207,348.80 and 79,109.20

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Solution

The fourth proportional to 138,362.32, 207,348.80 and 79,109.20 is: 118,552.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,362.32 : 207,348.80 = 79,109.20 : x
  2. Step 2: Convert to fraction form
    138,362.32/207,348.80 = 79,109.20/x
  3. Step 3: Cross multiply
    138,362.32x = 207,348.80 × 79,109.20
  4. Step 4: Simplify right side
    138,362.32x = 16,403,197,688.96
  5. Step 5: Solve for x
    x = 16,403,197,688.96/138,362.32
  6. Step 6: Final answer
    x = 118,552.49

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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.