Home / 138,710.48-191,426.74-78,286.40

Finding the Fourth Proportional to 138,710.48, 191,426.74 and 78,286.40

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Solution

The fourth proportional to 138,710.48, 191,426.74 and 78,286.40 is: 108,038.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,710.48 : 191,426.74 = 78,286.40 : x
  2. Step 2: Convert to fraction form
    138,710.48/191,426.74 = 78,286.40/x
  3. Step 3: Cross multiply
    138,710.48x = 191,426.74 × 78,286.40
  4. Step 4: Simplify right side
    138,710.48x = 14,986,110,343.70
  5. Step 5: Solve for x
    x = 14,986,110,343.70/138,710.48
  6. Step 6: Final answer
    x = 108,038.78

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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.