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Finding the Fourth Proportional to 887.34, 1,223.19 and 638.22

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Solution

The fourth proportional to 887.34, 1,223.19 and 638.22 is: 879.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.34 : 1,223.19 = 638.22 : x
  2. Step 2: Convert to fraction form
    887.34/1,223.19 = 638.22/x
  3. Step 3: Cross multiply
    887.34x = 1,223.19 × 638.22
  4. Step 4: Simplify right side
    887.34x = 780,664.32
  5. Step 5: Solve for x
    x = 780,664.32/887.34
  6. Step 6: Final answer
    x = 879.78

Related Problems

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Half scale
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Double scale
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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.