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Finding the Fourth Proportional to 320.94, 440.01 and 315.11

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Solution

The fourth proportional to 320.94, 440.01 and 315.11 is: 432.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.94 : 440.01 = 315.11 : x
  2. Step 2: Convert to fraction form
    320.94/440.01 = 315.11/x
  3. Step 3: Cross multiply
    320.94x = 440.01 × 315.11
  4. Step 4: Simplify right side
    320.94x = 138,649.35
  5. Step 5: Solve for x
    x = 138,649.35/320.94
  6. Step 6: Final answer
    x = 432.01

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.