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Finding the Fourth Proportional to 18,425.16, 25,426 and 10,871.80

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Solution

The fourth proportional to 18,425.16, 25,426 and 10,871.80 is: 15,002.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,425.16 : 25,426 = 10,871.80 : x
  2. Step 2: Convert to fraction form
    18,425.16/25,426 = 10,871.80/x
  3. Step 3: Cross multiply
    18,425.16x = 25,426 × 10,871.80
  4. Step 4: Simplify right side
    18,425.16x = 276,426,386.80
  5. Step 5: Solve for x
    x = 276,426,386.80/18,425.16
  6. Step 6: Final answer
    x = 15,002.66

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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.