Home / 42,405.80-63,584.40-12,819.20

Finding the Fourth Proportional to 42,405.80, 63,584.40 and 12,819.20

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Solution

The fourth proportional to 42,405.80, 63,584.40 and 12,819.20 is: 19,221.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,405.80 : 63,584.40 = 12,819.20 : x
  2. Step 2: Convert to fraction form
    42,405.80/63,584.40 = 12,819.20/x
  3. Step 3: Cross multiply
    42,405.80x = 63,584.40 × 12,819.20
  4. Step 4: Simplify right side
    42,405.80x = 815,101,140.48
  5. Step 5: Solve for x
    x = 815,101,140.48/42,405.80
  6. Step 6: Final answer
    x = 19,221.45

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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.