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Finding the Fourth Proportional to 18,373.72, 25,355.70 and 9,990.20

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Solution

The fourth proportional to 18,373.72, 25,355.70 and 9,990.20 is: 13,786.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,373.72 : 25,355.70 = 9,990.20 : x
  2. Step 2: Convert to fraction form
    18,373.72/25,355.70 = 9,990.20/x
  3. Step 3: Cross multiply
    18,373.72x = 25,355.70 × 9,990.20
  4. Step 4: Simplify right side
    18,373.72x = 253,308,514.14
  5. Step 5: Solve for x
    x = 253,308,514.14/18,373.72
  6. Step 6: Final answer
    x = 13,786.46

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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.