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Finding the Fourth Proportional to 18,643.16, 25,728.17 and 10,686.89

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Solution

The fourth proportional to 18,643.16, 25,728.17 and 10,686.89 is: 14,748.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,643.16 : 25,728.17 = 10,686.89 : x
  2. Step 2: Convert to fraction form
    18,643.16/25,728.17 = 10,686.89/x
  3. Step 3: Cross multiply
    18,643.16x = 25,728.17 × 10,686.89
  4. Step 4: Simplify right side
    18,643.16x = 274,954,122.69
  5. Step 5: Solve for x
    x = 274,954,122.69/18,643.16
  6. Step 6: Final answer
    x = 14,748.26

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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.