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Finding the Fourth Proportional to 18,717.80, 25,830.18 and 10,220.18

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Solution

The fourth proportional to 18,717.80, 25,830.18 and 10,220.18 is: 14,103.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,717.80 : 25,830.18 = 10,220.18 : x
  2. Step 2: Convert to fraction form
    18,717.80/25,830.18 = 10,220.18/x
  3. Step 3: Cross multiply
    18,717.80x = 25,830.18 × 10,220.18
  4. Step 4: Simplify right side
    18,717.80x = 263,989,089.03
  5. Step 5: Solve for x
    x = 263,989,089.03/18,717.80
  6. Step 6: Final answer
    x = 14,103.64

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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.