Home / 138,665.21-191,184.45-115,728.12

Finding the Fourth Proportional to 138,665.21, 191,184.45 and 115,728.12

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Solution

The fourth proportional to 138,665.21, 191,184.45 and 115,728.12 is: 159,559.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,665.21 : 191,184.45 = 115,728.12 : x
  2. Step 2: Convert to fraction form
    138,665.21/191,184.45 = 115,728.12/x
  3. Step 3: Cross multiply
    138,665.21x = 191,184.45 × 115,728.12
  4. Step 4: Simplify right side
    138,665.21x = 22,125,416,971.73
  5. Step 5: Solve for x
    x = 22,125,416,971.73/138,665.21
  6. Step 6: Final answer
    x = 159,559.98

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1.5x scale

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.