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Finding the Fourth Proportional to 644.16, 888.56 and 423.12

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Solution

The fourth proportional to 644.16, 888.56 and 423.12 is: 583.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.16 : 888.56 = 423.12 : x
  2. Step 2: Convert to fraction form
    644.16/888.56 = 423.12/x
  3. Step 3: Cross multiply
    644.16x = 888.56 × 423.12
  4. Step 4: Simplify right side
    644.16x = 375,967.51
  5. Step 5: Solve for x
    x = 375,967.51/644.16
  6. Step 6: Final answer
    x = 583.66

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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.