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Finding the Fourth Proportional to 887.02, 1,318.56 and 860.77

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Solution

The fourth proportional to 887.02, 1,318.56 and 860.77 is: 1,279.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.02 : 1,318.56 = 860.77 : x
  2. Step 2: Convert to fraction form
    887.02/1,318.56 = 860.77/x
  3. Step 3: Cross multiply
    887.02x = 1,318.56 × 860.77
  4. Step 4: Simplify right side
    887.02x = 1,134,976.89
  5. Step 5: Solve for x
    x = 1,134,976.89/887.02
  6. Step 6: Final answer
    x = 1,279.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.