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Finding the Fourth Proportional to 887.78, 1,226.21 and 722.64

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Solution

The fourth proportional to 887.78, 1,226.21 and 722.64 is: 998.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.78 : 1,226.21 = 722.64 : x
  2. Step 2: Convert to fraction form
    887.78/1,226.21 = 722.64/x
  3. Step 3: Cross multiply
    887.78x = 1,226.21 × 722.64
  4. Step 4: Simplify right side
    887.78x = 886,109.38
  5. Step 5: Solve for x
    x = 886,109.38/887.78
  6. Step 6: Final answer
    x = 998.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.