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Finding the Fourth Proportional to 3,178.98, 4,768.60 and 987.72

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Solution

The fourth proportional to 3,178.98, 4,768.60 and 987.72 is: 1,481.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.98 : 4,768.60 = 987.72 : x
  2. Step 2: Convert to fraction form
    3,178.98/4,768.60 = 987.72/x
  3. Step 3: Cross multiply
    3,178.98x = 4,768.60 × 987.72
  4. Step 4: Simplify right side
    3,178.98x = 4,710,041.59
  5. Step 5: Solve for x
    x = 4,710,041.59/3,178.98
  6. Step 6: Final answer
    x = 1,481.62

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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.