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Finding the Fourth Proportional to 18,369.90, 25,350.65 and 9,986.40

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Solution

The fourth proportional to 18,369.90, 25,350.65 and 9,986.40 is: 13,781.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,369.90 : 25,350.65 = 9,986.40 : x
  2. Step 2: Convert to fraction form
    18,369.90/25,350.65 = 9,986.40/x
  3. Step 3: Cross multiply
    18,369.90x = 25,350.65 × 9,986.40
  4. Step 4: Simplify right side
    18,369.90x = 253,161,756.13
  5. Step 5: Solve for x
    x = 253,161,756.13/18,369.90
  6. Step 6: Final answer
    x = 13,781.34

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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.