Home / 20,550.32-28,356.40-12,479.78

Finding the Fourth Proportional to 20,550.32, 28,356.40 and 12,479.78

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Solution

The fourth proportional to 20,550.32, 28,356.40 and 12,479.78 is: 17,220.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,550.32 : 28,356.40 = 12,479.78 : x
  2. Step 2: Convert to fraction form
    20,550.32/28,356.40 = 12,479.78/x
  3. Step 3: Cross multiply
    20,550.32x = 28,356.40 × 12,479.78
  4. Step 4: Simplify right side
    20,550.32x = 353,881,460.61
  5. Step 5: Solve for x
    x = 353,881,460.61/20,550.32
  6. Step 6: Final answer
    x = 17,220.24

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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.