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Finding the Fourth Proportional to 128,187.81, 176,749.12 and 87,376.10

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Solution

The fourth proportional to 128,187.81, 176,749.12 and 87,376.10 is: 120,476.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,187.81 : 176,749.12 = 87,376.10 : x
  2. Step 2: Convert to fraction form
    128,187.81/176,749.12 = 87,376.10/x
  3. Step 3: Cross multiply
    128,187.81x = 176,749.12 × 87,376.10
  4. Step 4: Simplify right side
    128,187.81x = 15,443,647,900.29
  5. Step 5: Solve for x
    x = 15,443,647,900.29/128,187.81
  6. Step 6: Final answer
    x = 120,476.73

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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.