Home / 138,421.40-207,621.30-54,165.20

Finding the Fourth Proportional to 138,421.40, 207,621.30 and 54,165.20

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Solution

The fourth proportional to 138,421.40, 207,621.30 and 54,165.20 is: 81,243.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,421.40 : 207,621.30 = 54,165.20 : x
  2. Step 2: Convert to fraction form
    138,421.40/207,621.30 = 54,165.20/x
  3. Step 3: Cross multiply
    138,421.40x = 207,621.30 × 54,165.20
  4. Step 4: Simplify right side
    138,421.40x = 11,245,849,238.76
  5. Step 5: Solve for x
    x = 11,245,849,238.76/138,421.40
  6. Step 6: Final answer
    x = 81,243.57

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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.