Home / 213,140.20-319,289.10-138,312.40

Finding the Fourth Proportional to 213,140.20, 319,289.10 and 138,312.40

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Solution

The fourth proportional to 213,140.20, 319,289.10 and 138,312.40 is: 207,195.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,140.20 : 319,289.10 = 138,312.40 : x
  2. Step 2: Convert to fraction form
    213,140.20/319,289.10 = 138,312.40/x
  3. Step 3: Cross multiply
    213,140.20x = 319,289.10 × 138,312.40
  4. Step 4: Simplify right side
    213,140.20x = 44,161,641,714.84
  5. Step 5: Solve for x
    x = 44,161,641,714.84/213,140.20
  6. Step 6: Final answer
    x = 207,195.27

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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.