Home / 2,987.40-4,122.74-1,728.42

Finding the Fourth Proportional to 2,987.40, 4,122.74 and 1,728.42

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Solution

The fourth proportional to 2,987.40, 4,122.74 and 1,728.42 is: 2,385.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.40 : 4,122.74 = 1,728.42 : x
  2. Step 2: Convert to fraction form
    2,987.40/4,122.74 = 1,728.42/x
  3. Step 3: Cross multiply
    2,987.40x = 4,122.74 × 1,728.42
  4. Step 4: Simplify right side
    2,987.40x = 7,125,817.63
  5. Step 5: Solve for x
    x = 7,125,817.63/2,987.40
  6. Step 6: Final answer
    x = 2,385.29

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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.