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Finding the Fourth Proportional to 16,902.80, 25,354.20 and 9,990.80

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Solution

The fourth proportional to 16,902.80, 25,354.20 and 9,990.80 is: 14,986.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,902.80 : 25,354.20 = 9,990.80 : x
  2. Step 2: Convert to fraction form
    16,902.80/25,354.20 = 9,990.80/x
  3. Step 3: Cross multiply
    16,902.80x = 25,354.20 × 9,990.80
  4. Step 4: Simplify right side
    16,902.80x = 253,308,741.36
  5. Step 5: Solve for x
    x = 253,308,741.36/16,902.80
  6. Step 6: Final answer
    x = 14,986.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.