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Finding the Fourth Proportional to 855.62, 1,284.96 and 787.02

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Solution

The fourth proportional to 855.62, 1,284.96 and 787.02 is: 1,181.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.62 : 1,284.96 = 787.02 : x
  2. Step 2: Convert to fraction form
    855.62/1,284.96 = 787.02/x
  3. Step 3: Cross multiply
    855.62x = 1,284.96 × 787.02
  4. Step 4: Simplify right side
    855.62x = 1,011,289.22
  5. Step 5: Solve for x
    x = 1,011,289.22/855.62
  6. Step 6: Final answer
    x = 1,181.94

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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.