Home / 138,938.20-208,407.30-76,730.20

Finding the Fourth Proportional to 138,938.20, 208,407.30 and 76,730.20

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Solution

The fourth proportional to 138,938.20, 208,407.30 and 76,730.20 is: 115,095.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,938.20 : 208,407.30 = 76,730.20 : x
  2. Step 2: Convert to fraction form
    138,938.20/208,407.30 = 76,730.20/x
  3. Step 3: Cross multiply
    138,938.20x = 208,407.30 × 76,730.20
  4. Step 4: Simplify right side
    138,938.20x = 15,991,133,810.46
  5. Step 5: Solve for x
    x = 15,991,133,810.46/138,938.20
  6. Step 6: Final answer
    x = 115,095.30

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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.