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Finding the Fourth Proportional to 406.78, 560.76 and 319.30

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Solution

The fourth proportional to 406.78, 560.76 and 319.30 is: 440.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.78 : 560.76 = 319.30 : x
  2. Step 2: Convert to fraction form
    406.78/560.76 = 319.30/x
  3. Step 3: Cross multiply
    406.78x = 560.76 × 319.30
  4. Step 4: Simplify right side
    406.78x = 179,050.67
  5. Step 5: Solve for x
    x = 179,050.67/406.78
  6. Step 6: Final answer
    x = 440.17

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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.