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Finding the Fourth Proportional to 2,858.36, 4,287.20 and 778.53

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Solution

The fourth proportional to 2,858.36, 4,287.20 and 778.53 is: 1,167.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,858.36 : 4,287.20 = 778.53 : x
  2. Step 2: Convert to fraction form
    2,858.36/4,287.20 = 778.53/x
  3. Step 3: Cross multiply
    2,858.36x = 4,287.20 × 778.53
  4. Step 4: Simplify right side
    2,858.36x = 3,337,696.77
  5. Step 5: Solve for x
    x = 3,337,696.77/2,858.36
  6. Step 6: Final answer
    x = 1,167.70

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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.