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Finding the Fourth Proportional to 440.40, 607.31 and 378.45

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Solution

The fourth proportional to 440.40, 607.31 and 378.45 is: 521.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.40 : 607.31 = 378.45 : x
  2. Step 2: Convert to fraction form
    440.40/607.31 = 378.45/x
  3. Step 3: Cross multiply
    440.40x = 607.31 × 378.45
  4. Step 4: Simplify right side
    440.40x = 229,834.58
  5. Step 5: Solve for x
    x = 229,834.58/440.40
  6. Step 6: Final answer
    x = 521.88

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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.