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Finding the Fourth Proportional to 12,808.79, 17,680.99 and 9,631.31

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Solution

The fourth proportional to 12,808.79, 17,680.99 and 9,631.31 is: 13,294.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,808.79 : 17,680.99 = 9,631.31 : x
  2. Step 2: Convert to fraction form
    12,808.79/17,680.99 = 9,631.31/x
  3. Step 3: Cross multiply
    12,808.79x = 17,680.99 × 9,631.31
  4. Step 4: Simplify right side
    12,808.79x = 170,291,095.80
  5. Step 5: Solve for x
    x = 170,291,095.80/12,808.79
  6. Step 6: Final answer
    x = 13,294.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.