Home / 138,621.80-207,932.70-128,124.20

Finding the Fourth Proportional to 138,621.80, 207,932.70 and 128,124.20

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Solution

The fourth proportional to 138,621.80, 207,932.70 and 128,124.20 is: 192,186.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,621.80 : 207,932.70 = 128,124.20 : x
  2. Step 2: Convert to fraction form
    138,621.80/207,932.70 = 128,124.20/x
  3. Step 3: Cross multiply
    138,621.80x = 207,932.70 × 128,124.20
  4. Step 4: Simplify right side
    138,621.80x = 26,641,210,841.34
  5. Step 5: Solve for x
    x = 26,641,210,841.34/138,621.80
  6. Step 6: Final answer
    x = 192,186.30

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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.