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Finding the Fourth Proportional to 853.57, 1,178.58 and 558.73

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Solution

The fourth proportional to 853.57, 1,178.58 and 558.73 is: 771.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.57 : 1,178.58 = 558.73 : x
  2. Step 2: Convert to fraction form
    853.57/1,178.58 = 558.73/x
  3. Step 3: Cross multiply
    853.57x = 1,178.58 × 558.73
  4. Step 4: Simplify right side
    853.57x = 658,508.00
  5. Step 5: Solve for x
    x = 658,508.00/853.57
  6. Step 6: Final answer
    x = 771.48

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.