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Finding the Fourth Proportional to 18,369.12, 25,349.76 and 9,986.16

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Solution

The fourth proportional to 18,369.12, 25,349.76 and 9,986.16 is: 13,781.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,369.12 : 25,349.76 = 9,986.16 : x
  2. Step 2: Convert to fraction form
    18,369.12/25,349.76 = 9,986.16/x
  3. Step 3: Cross multiply
    18,369.12x = 25,349.76 × 9,986.16
  4. Step 4: Simplify right side
    18,369.12x = 253,146,759.32
  5. Step 5: Solve for x
    x = 253,146,759.32/18,369.12
  6. Step 6: Final answer
    x = 13,781.10

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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.