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Finding the Fourth Proportional to 18,617.80, 25,686.78 and 10,658.54

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Solution

The fourth proportional to 18,617.80, 25,686.78 and 10,658.54 is: 14,705.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,617.80 : 25,686.78 = 10,658.54 : x
  2. Step 2: Convert to fraction form
    18,617.80/25,686.78 = 10,658.54/x
  3. Step 3: Cross multiply
    18,617.80x = 25,686.78 × 10,658.54
  4. Step 4: Simplify right side
    18,617.80x = 273,783,572.10
  5. Step 5: Solve for x
    x = 273,783,572.10/18,617.80
  6. Step 6: Final answer
    x = 14,705.47

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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.