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Finding the Fourth Proportional to 3,178.58, 4,767.88 and 987.31

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Solution

The fourth proportional to 3,178.58, 4,767.88 and 987.31 is: 1,480.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.58 : 4,767.88 = 987.31 : x
  2. Step 2: Convert to fraction form
    3,178.58/4,767.88 = 987.31/x
  3. Step 3: Cross multiply
    3,178.58x = 4,767.88 × 987.31
  4. Step 4: Simplify right side
    3,178.58x = 4,707,361.21
  5. Step 5: Solve for x
    x = 4,707,361.21/3,178.58
  6. Step 6: Final answer
    x = 1,480.96

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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.