Home / 138,931.20-191,710.80-78,497.10

Finding the Fourth Proportional to 138,931.20, 191,710.80 and 78,497.10

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Solution

The fourth proportional to 138,931.20, 191,710.80 and 78,497.10 is: 108,317.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,931.20 : 191,710.80 = 78,497.10 : x
  2. Step 2: Convert to fraction form
    138,931.20/191,710.80 = 78,497.10/x
  3. Step 3: Cross multiply
    138,931.20x = 191,710.80 × 78,497.10
  4. Step 4: Simplify right side
    138,931.20x = 15,048,741,838.68
  5. Step 5: Solve for x
    x = 15,048,741,838.68/138,931.20
  6. Step 6: Final answer
    x = 108,317.94

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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.