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Finding the Fourth Proportional to 854.66, 1,279.89 and 545.60

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Solution

The fourth proportional to 854.66, 1,279.89 and 545.60 is: 817.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.66 : 1,279.89 = 545.60 : x
  2. Step 2: Convert to fraction form
    854.66/1,279.89 = 545.60/x
  3. Step 3: Cross multiply
    854.66x = 1,279.89 × 545.60
  4. Step 4: Simplify right side
    854.66x = 698,307.98
  5. Step 5: Solve for x
    x = 698,307.98/854.66
  6. Step 6: Final answer
    x = 817.06

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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.