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Finding the Fourth Proportional to 178,916.80, 268,144.80 and 85,220.80

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Solution

The fourth proportional to 178,916.80, 268,144.80 and 85,220.80 is: 127,721.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    178,916.80 : 268,144.80 = 85,220.80 : x
  2. Step 2: Convert to fraction form
    178,916.80/268,144.80 = 85,220.80/x
  3. Step 3: Cross multiply
    178,916.80x = 268,144.80 × 85,220.80
  4. Step 4: Simplify right side
    178,916.80x = 22,851,514,371.84
  5. Step 5: Solve for x
    x = 22,851,514,371.84/178,916.80
  6. Step 6: Final answer
    x = 127,721.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.