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Finding the Fourth Proportional to 867.89, 1,302.34 and 320.45

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Solution

The fourth proportional to 867.89, 1,302.34 and 320.45 is: 480.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.89 : 1,302.34 = 320.45 : x
  2. Step 2: Convert to fraction form
    867.89/1,302.34 = 320.45/x
  3. Step 3: Cross multiply
    867.89x = 1,302.34 × 320.45
  4. Step 4: Simplify right side
    867.89x = 417,335.47
  5. Step 5: Solve for x
    x = 417,335.47/867.89
  6. Step 6: Final answer
    x = 480.86

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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.