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Finding the Fourth Proportional to 18,615.86, 25,689.95 and 10,658.15

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Solution

The fourth proportional to 18,615.86, 25,689.95 and 10,658.15 is: 14,708.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,615.86 : 25,689.95 = 10,658.15 : x
  2. Step 2: Convert to fraction form
    18,615.86/25,689.95 = 10,658.15/x
  3. Step 3: Cross multiply
    18,615.86x = 25,689.95 × 10,658.15
  4. Step 4: Simplify right side
    18,615.86x = 273,807,340.59
  5. Step 5: Solve for x
    x = 273,807,340.59/18,615.86
  6. Step 6: Final answer
    x = 14,708.28

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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.