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Finding the Fourth Proportional to 12,388.80, 18,550.80 and 9,775.20

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Solution

The fourth proportional to 12,388.80, 18,550.80 and 9,775.20 is: 14,637.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,388.80 : 18,550.80 = 9,775.20 : x
  2. Step 2: Convert to fraction form
    12,388.80/18,550.80 = 9,775.20/x
  3. Step 3: Cross multiply
    12,388.80x = 18,550.80 × 9,775.20
  4. Step 4: Simplify right side
    12,388.80x = 181,337,780.16
  5. Step 5: Solve for x
    x = 181,337,780.16/12,388.80
  6. Step 6: Final answer
    x = 14,637.24

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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.