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Finding the Fourth Proportional to 18,615.11, 25,689.10 and 10,117.40

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Solution

The fourth proportional to 18,615.11, 25,689.10 and 10,117.40 is: 13,962.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,615.11 : 25,689.10 = 10,117.40 : x
  2. Step 2: Convert to fraction form
    18,615.11/25,689.10 = 10,117.40/x
  3. Step 3: Cross multiply
    18,615.11x = 25,689.10 × 10,117.40
  4. Step 4: Simplify right side
    18,615.11x = 259,906,771.89
  5. Step 5: Solve for x
    x = 259,906,771.89/18,615.11
  6. Step 6: Final answer
    x = 13,962.14

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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.