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Finding the Fourth Proportional to 18,702.20, 25,809.02 and 10,318.70

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Solution

The fourth proportional to 18,702.20, 25,809.02 and 10,318.70 is: 14,239.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,702.20 : 25,809.02 = 10,318.70 : x
  2. Step 2: Convert to fraction form
    18,702.20/25,809.02 = 10,318.70/x
  3. Step 3: Cross multiply
    18,702.20x = 25,809.02 × 10,318.70
  4. Step 4: Simplify right side
    18,702.20x = 266,315,534.67
  5. Step 5: Solve for x
    x = 266,315,534.67/18,702.20
  6. Step 6: Final answer
    x = 14,239.80

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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.