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Finding the Fourth Proportional to 644, 887.68 and 564.32

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Solution

The fourth proportional to 644, 887.68 and 564.32 is: 777.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    644 : 887.68 = 564.32 : x
  2. Step 2: Convert to fraction form
    644/887.68 = 564.32/x
  3. Step 3: Cross multiply
    644x = 887.68 × 564.32
  4. Step 4: Simplify right side
    644x = 500,935.58
  5. Step 5: Solve for x
    x = 500,935.58/644
  6. Step 6: Final answer
    x = 777.85

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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.