Home / 138,731.20-208,096.80-49,987.60

Finding the Fourth Proportional to 138,731.20, 208,096.80 and 49,987.60

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Solution

The fourth proportional to 138,731.20, 208,096.80 and 49,987.60 is: 74,981.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,731.20 : 208,096.80 = 49,987.60 : x
  2. Step 2: Convert to fraction form
    138,731.20/208,096.80 = 49,987.60/x
  3. Step 3: Cross multiply
    138,731.20x = 208,096.80 × 49,987.60
  4. Step 4: Simplify right side
    138,731.20x = 10,402,259,599.68
  5. Step 5: Solve for x
    x = 10,402,259,599.68/138,731.20
  6. Step 6: Final answer
    x = 74,981.40

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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.