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Finding the Fourth Proportional to 867.78, 1,302.48 and 543.78

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Solution

The fourth proportional to 867.78, 1,302.48 and 543.78 is: 816.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.78 : 1,302.48 = 543.78 : x
  2. Step 2: Convert to fraction form
    867.78/1,302.48 = 543.78/x
  3. Step 3: Cross multiply
    867.78x = 1,302.48 × 543.78
  4. Step 4: Simplify right side
    867.78x = 708,262.57
  5. Step 5: Solve for x
    x = 708,262.57/867.78
  6. Step 6: Final answer
    x = 816.18

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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.