Home / 21,037.76-31,515.60-12,254.40

Finding the Fourth Proportional to 21,037.76, 31,515.60 and 12,254.40

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Solution

The fourth proportional to 21,037.76, 31,515.60 and 12,254.40 is: 18,357.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,037.76 : 31,515.60 = 12,254.40 : x
  2. Step 2: Convert to fraction form
    21,037.76/31,515.60 = 12,254.40/x
  3. Step 3: Cross multiply
    21,037.76x = 31,515.60 × 12,254.40
  4. Step 4: Simplify right side
    21,037.76x = 386,204,768.64
  5. Step 5: Solve for x
    x = 386,204,768.64/21,037.76
  6. Step 6: Final answer
    x = 18,357.69

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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.