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Finding the Fourth Proportional to 870.08, 1,305.12 and 220.81

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Solution

The fourth proportional to 870.08, 1,305.12 and 220.81 is: 331.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.08 : 1,305.12 = 220.81 : x
  2. Step 2: Convert to fraction form
    870.08/1,305.12 = 220.81/x
  3. Step 3: Cross multiply
    870.08x = 1,305.12 × 220.81
  4. Step 4: Simplify right side
    870.08x = 288,182.44
  5. Step 5: Solve for x
    x = 288,182.44/870.08
  6. Step 6: Final answer
    x = 331.22

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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.