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Finding the Fourth Proportional to 209,957.10, 315,008.55 and 91,713.30

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Solution

The fourth proportional to 209,957.10, 315,008.55 and 91,713.30 is: 137,601.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,957.10 : 315,008.55 = 91,713.30 : x
  2. Step 2: Convert to fraction form
    209,957.10/315,008.55 = 91,713.30/x
  3. Step 3: Cross multiply
    209,957.10x = 315,008.55 × 91,713.30
  4. Step 4: Simplify right side
    209,957.10x = 28,890,473,648.72
  5. Step 5: Solve for x
    x = 28,890,473,648.72/209,957.10
  6. Step 6: Final answer
    x = 137,601.79

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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.