Home / 2,987.72-4,123.58-1,728.58

Finding the Fourth Proportional to 2,987.72, 4,123.58 and 1,728.58

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Solution

The fourth proportional to 2,987.72, 4,123.58 and 1,728.58 is: 2,385.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.72 : 4,123.58 = 1,728.58 : x
  2. Step 2: Convert to fraction form
    2,987.72/4,123.58 = 1,728.58/x
  3. Step 3: Cross multiply
    2,987.72x = 4,123.58 × 1,728.58
  4. Step 4: Simplify right side
    2,987.72x = 7,127,937.92
  5. Step 5: Solve for x
    x = 7,127,937.92/2,987.72
  6. Step 6: Final answer
    x = 2,385.74

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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.