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Finding the Fourth Proportional to 614.44, 921.30 and 421.84

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Solution

The fourth proportional to 614.44, 921.30 and 421.84 is: 632.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.44 : 921.30 = 421.84 : x
  2. Step 2: Convert to fraction form
    614.44/921.30 = 421.84/x
  3. Step 3: Cross multiply
    614.44x = 921.30 × 421.84
  4. Step 4: Simplify right side
    614.44x = 388,641.19
  5. Step 5: Solve for x
    x = 388,641.19/614.44
  6. Step 6: Final answer
    x = 632.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.