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Finding the Fourth Proportional to 1,178.60, 1,768.50 and 485.80

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Solution

The fourth proportional to 1,178.60, 1,768.50 and 485.80 is: 728.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.60 : 1,768.50 = 485.80 : x
  2. Step 2: Convert to fraction form
    1,178.60/1,768.50 = 485.80/x
  3. Step 3: Cross multiply
    1,178.60x = 1,768.50 × 485.80
  4. Step 4: Simplify right side
    1,178.60x = 859,137.30
  5. Step 5: Solve for x
    x = 859,137.30/1,178.60
  6. Step 6: Final answer
    x = 728.95

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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.