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Finding the Fourth Proportional to 868.35, 1,299.29 and 858.63

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Solution

The fourth proportional to 868.35, 1,299.29 and 858.63 is: 1,284.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.35 : 1,299.29 = 858.63 : x
  2. Step 2: Convert to fraction form
    868.35/1,299.29 = 858.63/x
  3. Step 3: Cross multiply
    868.35x = 1,299.29 × 858.63
  4. Step 4: Simplify right side
    868.35x = 1,115,605.08
  5. Step 5: Solve for x
    x = 1,115,605.08/868.35
  6. Step 6: Final answer
    x = 1,284.74

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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.