Home / 138,670.12-191,360.28-87,710.68

Finding the Fourth Proportional to 138,670.12, 191,360.28 and 87,710.68

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Solution

The fourth proportional to 138,670.12, 191,360.28 and 87,710.68 is: 121,037.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,670.12 : 191,360.28 = 87,710.68 : x
  2. Step 2: Convert to fraction form
    138,670.12/191,360.28 = 87,710.68/x
  3. Step 3: Cross multiply
    138,670.12x = 191,360.28 × 87,710.68
  4. Step 4: Simplify right side
    138,670.12x = 16,784,340,283.79
  5. Step 5: Solve for x
    x = 16,784,340,283.79/138,670.12
  6. Step 6: Final answer
    x = 121,037.90

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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.