Home / 2,138.48-2,950.76-1,287.60

Finding the Fourth Proportional to 2,138.48, 2,950.76 and 1,287.60

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Solution

The fourth proportional to 2,138.48, 2,950.76 and 1,287.60 is: 1,776.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.48 : 2,950.76 = 1,287.60 : x
  2. Step 2: Convert to fraction form
    2,138.48/2,950.76 = 1,287.60/x
  3. Step 3: Cross multiply
    2,138.48x = 2,950.76 × 1,287.60
  4. Step 4: Simplify right side
    2,138.48x = 3,799,398.58
  5. Step 5: Solve for x
    x = 3,799,398.58/2,138.48
  6. Step 6: Final answer
    x = 1,776.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.