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Finding the Fourth Proportional to 11,909.40, 16,434.92 and 6,605

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Solution

The fourth proportional to 11,909.40, 16,434.92 and 6,605 is: 9,114.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,909.40 : 16,434.92 = 6,605 : x
  2. Step 2: Convert to fraction form
    11,909.40/16,434.92 = 6,605/x
  3. Step 3: Cross multiply
    11,909.40x = 16,434.92 × 6,605
  4. Step 4: Simplify right side
    11,909.40x = 108,552,646.60
  5. Step 5: Solve for x
    x = 108,552,646.60/11,909.40
  6. Step 6: Final answer
    x = 9,114.87

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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.