Home / 138,508.87-191,130.75-78,094.36

Finding the Fourth Proportional to 138,508.87, 191,130.75 and 78,094.36

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Solution

The fourth proportional to 138,508.87, 191,130.75 and 78,094.36 is: 107,763.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,508.87 : 191,130.75 = 78,094.36 : x
  2. Step 2: Convert to fraction form
    138,508.87/191,130.75 = 78,094.36/x
  3. Step 3: Cross multiply
    138,508.87x = 191,130.75 × 78,094.36
  4. Step 4: Simplify right side
    138,508.87x = 14,926,233,597.57
  5. Step 5: Solve for x
    x = 14,926,233,597.57/138,508.87
  6. Step 6: Final answer
    x = 107,763.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.