Home / 138,069.36-207,311.40-78,971.76

Finding the Fourth Proportional to 138,069.36, 207,311.40 and 78,971.76

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Solution

The fourth proportional to 138,069.36, 207,311.40 and 78,971.76 is: 118,576.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,069.36 : 207,311.40 = 78,971.76 : x
  2. Step 2: Convert to fraction form
    138,069.36/207,311.40 = 78,971.76/x
  3. Step 3: Cross multiply
    138,069.36x = 207,311.40 × 78,971.76
  4. Step 4: Simplify right side
    138,069.36x = 16,371,746,126.06
  5. Step 5: Solve for x
    x = 16,371,746,126.06/138,069.36
  6. Step 6: Final answer
    x = 118,576.24

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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.