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Finding the Fourth Proportional to 14,991.80, 20,681.34 and 9,691.16

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Solution

The fourth proportional to 14,991.80, 20,681.34 and 9,691.16 is: 13,369.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,991.80 : 20,681.34 = 9,691.16 : x
  2. Step 2: Convert to fraction form
    14,991.80/20,681.34 = 9,691.16/x
  3. Step 3: Cross multiply
    14,991.80x = 20,681.34 × 9,691.16
  4. Step 4: Simplify right side
    14,991.80x = 200,426,174.95
  5. Step 5: Solve for x
    x = 200,426,174.95/14,991.80
  6. Step 6: Final answer
    x = 13,369.05

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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.