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Finding the Fourth Proportional to 855.70, 1,283.55 and 842.90

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Solution

The fourth proportional to 855.70, 1,283.55 and 842.90 is: 1,264.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.70 : 1,283.55 = 842.90 : x
  2. Step 2: Convert to fraction form
    855.70/1,283.55 = 842.90/x
  3. Step 3: Cross multiply
    855.70x = 1,283.55 × 842.90
  4. Step 4: Simplify right side
    855.70x = 1,081,904.30
  5. Step 5: Solve for x
    x = 1,081,904.30/855.70
  6. Step 6: Final answer
    x = 1,264.35

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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.