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Finding the Fourth Proportional to 172,916.80, 258,957.20 and 143,115.28

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Solution

The fourth proportional to 172,916.80, 258,957.20 and 143,115.28 is: 214,326.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,916.80 : 258,957.20 = 143,115.28 : x
  2. Step 2: Convert to fraction form
    172,916.80/258,957.20 = 143,115.28/x
  3. Step 3: Cross multiply
    172,916.80x = 258,957.20 × 143,115.28
  4. Step 4: Simplify right side
    172,916.80x = 37,060,732,186.02
  5. Step 5: Solve for x
    x = 37,060,732,186.02/172,916.80
  6. Step 6: Final answer
    x = 214,326.96

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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.