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Finding the Fourth Proportional to 611,347.20, 917,020.80 and 168,115.20

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Solution

The fourth proportional to 611,347.20, 917,020.80 and 168,115.20 is: 252,172.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,347.20 : 917,020.80 = 168,115.20 : x
  2. Step 2: Convert to fraction form
    611,347.20/917,020.80 = 168,115.20/x
  3. Step 3: Cross multiply
    611,347.20x = 917,020.80 × 168,115.20
  4. Step 4: Simplify right side
    611,347.20x = 154,165,135,196.16
  5. Step 5: Solve for x
    x = 154,165,135,196.16/611,347.20
  6. Step 6: Final answer
    x = 252,172.80

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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.