Home / 20,345.40-28,076.40-12,387.60

Finding the Fourth Proportional to 20,345.40, 28,076.40 and 12,387.60

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Solution

The fourth proportional to 20,345.40, 28,076.40 and 12,387.60 is: 17,094.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,345.40 : 28,076.40 = 12,387.60 : x
  2. Step 2: Convert to fraction form
    20,345.40/28,076.40 = 12,387.60/x
  3. Step 3: Cross multiply
    20,345.40x = 28,076.40 × 12,387.60
  4. Step 4: Simplify right side
    20,345.40x = 347,799,212.64
  5. Step 5: Solve for x
    x = 347,799,212.64/20,345.40
  6. Step 6: Final answer
    x = 17,094.73

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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.