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Finding the Fourth Proportional to 887.08, 1,321.04 and 864.40

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Solution

The fourth proportional to 887.08, 1,321.04 and 864.40 is: 1,287.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.08 : 1,321.04 = 864.40 : x
  2. Step 2: Convert to fraction form
    887.08/1,321.04 = 864.40/x
  3. Step 3: Cross multiply
    887.08x = 1,321.04 × 864.40
  4. Step 4: Simplify right side
    887.08x = 1,141,906.98
  5. Step 5: Solve for x
    x = 1,141,906.98/887.08
  6. Step 6: Final answer
    x = 1,287.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.