Home / 128,717.72-177,635.28-72,127

Finding the Fourth Proportional to 128,717.72, 177,635.28 and 72,127

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Solution

The fourth proportional to 128,717.72, 177,635.28 and 72,127 is: 99,537.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,717.72 : 177,635.28 = 72,127 : x
  2. Step 2: Convert to fraction form
    128,717.72/177,635.28 = 72,127/x
  3. Step 3: Cross multiply
    128,717.72x = 177,635.28 × 72,127
  4. Step 4: Simplify right side
    128,717.72x = 12,812,299,840.56
  5. Step 5: Solve for x
    x = 12,812,299,840.56/128,717.72
  6. Step 6: Final answer
    x = 99,537.96

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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.