Home / 2,987.60-4,122.84-1,728.68

Finding the Fourth Proportional to 2,987.60, 4,122.84 and 1,728.68

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Solution

The fourth proportional to 2,987.60, 4,122.84 and 1,728.68 is: 2,385.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.60 : 4,122.84 = 1,728.68 : x
  2. Step 2: Convert to fraction form
    2,987.60/4,122.84 = 1,728.68/x
  3. Step 3: Cross multiply
    2,987.60x = 4,122.84 × 1,728.68
  4. Step 4: Simplify right side
    2,987.60x = 7,127,071.05
  5. Step 5: Solve for x
    x = 7,127,071.05/2,987.60
  6. Step 6: Final answer
    x = 2,385.55

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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.