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Finding the Fourth Proportional to 1,987.39, 2,981.46 and 891.73

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Solution

The fourth proportional to 1,987.39, 2,981.46 and 891.73 is: 1,337.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.39 : 2,981.46 = 891.73 : x
  2. Step 2: Convert to fraction form
    1,987.39/2,981.46 = 891.73/x
  3. Step 3: Cross multiply
    1,987.39x = 2,981.46 × 891.73
  4. Step 4: Simplify right side
    1,987.39x = 2,658,657.33
  5. Step 5: Solve for x
    x = 2,658,657.33/1,987.39
  6. Step 6: Final answer
    x = 1,337.76

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1.5x scale

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.