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Finding the Fourth Proportional to 18,620.79, 25,689.42 and 10,658.76

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Solution

The fourth proportional to 18,620.79, 25,689.42 and 10,658.76 is: 14,704.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,620.79 : 25,689.42 = 10,658.76 : x
  2. Step 2: Convert to fraction form
    18,620.79/25,689.42 = 10,658.76/x
  3. Step 3: Cross multiply
    18,620.79x = 25,689.42 × 10,658.76
  4. Step 4: Simplify right side
    18,620.79x = 273,817,362.32
  5. Step 5: Solve for x
    x = 273,817,362.32/18,620.79
  6. Step 6: Final answer
    x = 14,704.93

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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.