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Finding the Fourth Proportional to 853.32, 1,281.35 and 545.31

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Solution

The fourth proportional to 853.32, 1,281.35 and 545.31 is: 818.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.32 : 1,281.35 = 545.31 : x
  2. Step 2: Convert to fraction form
    853.32/1,281.35 = 545.31/x
  3. Step 3: Cross multiply
    853.32x = 1,281.35 × 545.31
  4. Step 4: Simplify right side
    853.32x = 698,730.24
  5. Step 5: Solve for x
    x = 698,730.24/853.32
  6. Step 6: Final answer
    x = 818.84

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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.