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Finding the Fourth Proportional to 439.38, 607.18 and 315.46

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Solution

The fourth proportional to 439.38, 607.18 and 315.46 is: 435.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.38 : 607.18 = 315.46 : x
  2. Step 2: Convert to fraction form
    439.38/607.18 = 315.46/x
  3. Step 3: Cross multiply
    439.38x = 607.18 × 315.46
  4. Step 4: Simplify right side
    439.38x = 191,541.00
  5. Step 5: Solve for x
    x = 191,541.00/439.38
  6. Step 6: Final answer
    x = 435.93

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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.