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Finding the Fourth Proportional to 128,071.68, 176,748.93 and 71,491.56

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Solution

The fourth proportional to 128,071.68, 176,748.93 and 71,491.56 is: 98,663.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,071.68 : 176,748.93 = 71,491.56 : x
  2. Step 2: Convert to fraction form
    128,071.68/176,748.93 = 71,491.56/x
  3. Step 3: Cross multiply
    128,071.68x = 176,748.93 × 71,491.56
  4. Step 4: Simplify right side
    128,071.68x = 12,636,056,734.03
  5. Step 5: Solve for x
    x = 12,636,056,734.03/128,071.68
  6. Step 6: Final answer
    x = 98,663.94

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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.