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Finding the Fourth Proportional to 331.40, 457.74 and 313.16

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Solution

The fourth proportional to 331.40, 457.74 and 313.16 is: 432.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.40 : 457.74 = 313.16 : x
  2. Step 2: Convert to fraction form
    331.40/457.74 = 313.16/x
  3. Step 3: Cross multiply
    331.40x = 457.74 × 313.16
  4. Step 4: Simplify right side
    331.40x = 143,345.86
  5. Step 5: Solve for x
    x = 143,345.86/331.40
  6. Step 6: Final answer
    x = 432.55

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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.