Home / 20,877.39-28,809.54-12,380.31

Finding the Fourth Proportional to 20,877.39, 28,809.54 and 12,380.31

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Solution

The fourth proportional to 20,877.39, 28,809.54 and 12,380.31 is: 17,084.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,877.39 : 28,809.54 = 12,380.31 : x
  2. Step 2: Convert to fraction form
    20,877.39/28,809.54 = 12,380.31/x
  3. Step 3: Cross multiply
    20,877.39x = 28,809.54 × 12,380.31
  4. Step 4: Simplify right side
    20,877.39x = 356,671,036.16
  5. Step 5: Solve for x
    x = 356,671,036.16/20,877.39
  6. Step 6: Final answer
    x = 17,084.08

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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.