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Finding the Fourth Proportional to 854.54, 1,279.38 and 561.72

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Solution

The fourth proportional to 854.54, 1,279.38 and 561.72 is: 840.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.54 : 1,279.38 = 561.72 : x
  2. Step 2: Convert to fraction form
    854.54/1,279.38 = 561.72/x
  3. Step 3: Cross multiply
    854.54x = 1,279.38 × 561.72
  4. Step 4: Simplify right side
    854.54x = 718,653.33
  5. Step 5: Solve for x
    x = 718,653.33/854.54
  6. Step 6: Final answer
    x = 840.98

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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.