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Finding the Fourth Proportional to 858.40, 1,284.86 and 676.15

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Solution

The fourth proportional to 858.40, 1,284.86 and 676.15 is: 1,012.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.40 : 1,284.86 = 676.15 : x
  2. Step 2: Convert to fraction form
    858.40/1,284.86 = 676.15/x
  3. Step 3: Cross multiply
    858.40x = 1,284.86 × 676.15
  4. Step 4: Simplify right side
    858.40x = 868,756.57
  5. Step 5: Solve for x
    x = 868,756.57/858.40
  6. Step 6: Final answer
    x = 1,012.07

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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.