Home / 19,987.20-29,980.80-8,140.95

Finding the Fourth Proportional to 19,987.20, 29,980.80 and 8,140.95

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Solution

The fourth proportional to 19,987.20, 29,980.80 and 8,140.95 is: 12,211.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,987.20 : 29,980.80 = 8,140.95 : x
  2. Step 2: Convert to fraction form
    19,987.20/29,980.80 = 8,140.95/x
  3. Step 3: Cross multiply
    19,987.20x = 29,980.80 × 8,140.95
  4. Step 4: Simplify right side
    19,987.20x = 244,072,193.76
  5. Step 5: Solve for x
    x = 244,072,193.76/19,987.20
  6. Step 6: Final answer
    x = 12,211.43

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1.5x scale

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.