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Finding the Fourth Proportional to 440.72, 661.30 and 319.98

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Solution

The fourth proportional to 440.72, 661.30 and 319.98 is: 480.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.72 : 661.30 = 319.98 : x
  2. Step 2: Convert to fraction form
    440.72/661.30 = 319.98/x
  3. Step 3: Cross multiply
    440.72x = 661.30 × 319.98
  4. Step 4: Simplify right side
    440.72x = 211,599.47
  5. Step 5: Solve for x
    x = 211,599.47/440.72
  6. Step 6: Final answer
    x = 480.13

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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.