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Finding the Fourth Proportional to 3,987.58, 5,981.40 and 1,390.52

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Solution

The fourth proportional to 3,987.58, 5,981.40 and 1,390.52 is: 2,085.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.58 : 5,981.40 = 1,390.52 : x
  2. Step 2: Convert to fraction form
    3,987.58/5,981.40 = 1,390.52/x
  3. Step 3: Cross multiply
    3,987.58x = 5,981.40 × 1,390.52
  4. Step 4: Simplify right side
    3,987.58x = 8,317,256.33
  5. Step 5: Solve for x
    x = 8,317,256.33/3,987.58
  6. Step 6: Final answer
    x = 2,085.79

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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.