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Finding the Fourth Proportional to 172,465,699.80, 258,698,549.70 and 86,217,418.20

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Solution

The fourth proportional to 172,465,699.80, 258,698,549.70 and 86,217,418.20 is: 129,326,127.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,465,699.80 : 258,698,549.70 = 86,217,418.20 : x
  2. Step 2: Convert to fraction form
    172,465,699.80/258,698,549.70 = 86,217,418.20/x
  3. Step 3: Cross multiply
    172,465,699.80x = 258,698,549.70 × 86,217,418.20
  4. Step 4: Simplify right side
    172,465,699.80x = 22,304,321,047,218,384
  5. Step 5: Solve for x
    x = 22,304,321,047,218,384/172,465,699.80
  6. Step 6: Final answer
    x = 129,326,127.30

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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.