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Finding the Fourth Proportional to 870.82, 1,305.40 and 322.86

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Solution

The fourth proportional to 870.82, 1,305.40 and 322.86 is: 483.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.82 : 1,305.40 = 322.86 : x
  2. Step 2: Convert to fraction form
    870.82/1,305.40 = 322.86/x
  3. Step 3: Cross multiply
    870.82x = 1,305.40 × 322.86
  4. Step 4: Simplify right side
    870.82x = 421,453.30
  5. Step 5: Solve for x
    x = 421,453.30/870.82
  6. Step 6: Final answer
    x = 483.97

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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.