Home / 213,139.20-319,287.60-138,311.40

Finding the Fourth Proportional to 213,139.20, 319,287.60 and 138,311.40

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Solution

The fourth proportional to 213,139.20, 319,287.60 and 138,311.40 is: 207,193.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,139.20 : 319,287.60 = 138,311.40 : x
  2. Step 2: Convert to fraction form
    213,139.20/319,287.60 = 138,311.40/x
  3. Step 3: Cross multiply
    213,139.20x = 319,287.60 × 138,311.40
  4. Step 4: Simplify right side
    213,139.20x = 44,161,114,958.64
  5. Step 5: Solve for x
    x = 44,161,114,958.64/213,139.20
  6. Step 6: Final answer
    x = 207,193.77

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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.