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Finding the Fourth Proportional to 644, 888.72 and 368

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Solution

The fourth proportional to 644, 888.72 and 368 is: 507.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    644 : 888.72 = 368 : x
  2. Step 2: Convert to fraction form
    644/888.72 = 368/x
  3. Step 3: Cross multiply
    644x = 888.72 × 368
  4. Step 4: Simplify right side
    644x = 327,048.96
  5. Step 5: Solve for x
    x = 327,048.96/644
  6. Step 6: Final answer
    x = 507.84

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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.