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Finding the Fourth Proportional to 128,731.53, 177,649.50 and 71,370.67

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Solution

The fourth proportional to 128,731.53, 177,649.50 and 71,370.67 is: 98,491.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,731.53 : 177,649.50 = 71,370.67 : x
  2. Step 2: Convert to fraction form
    128,731.53/177,649.50 = 71,370.67/x
  3. Step 3: Cross multiply
    128,731.53x = 177,649.50 × 71,370.67
  4. Step 4: Simplify right side
    128,731.53x = 12,678,963,996.77
  5. Step 5: Solve for x
    x = 12,678,963,996.77/128,731.53
  6. Step 6: Final answer
    x = 98,491.52

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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.