Home / 21,319.60-31,979.40-12,103.60

Finding the Fourth Proportional to 21,319.60, 31,979.40 and 12,103.60

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Solution

The fourth proportional to 21,319.60, 31,979.40 and 12,103.60 is: 18,155.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,319.60 : 31,979.40 = 12,103.60 : x
  2. Step 2: Convert to fraction form
    21,319.60/31,979.40 = 12,103.60/x
  3. Step 3: Cross multiply
    21,319.60x = 31,979.40 × 12,103.60
  4. Step 4: Simplify right side
    21,319.60x = 387,065,865.84
  5. Step 5: Solve for x
    x = 387,065,865.84/21,319.60
  6. Step 6: Final answer
    x = 18,155.40

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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.