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Finding the Fourth Proportional to 518.78, 715.74 and 322.22

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Solution

The fourth proportional to 518.78, 715.74 and 322.22 is: 444.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.78 : 715.74 = 322.22 : x
  2. Step 2: Convert to fraction form
    518.78/715.74 = 322.22/x
  3. Step 3: Cross multiply
    518.78x = 715.74 × 322.22
  4. Step 4: Simplify right side
    518.78x = 230,625.74
  5. Step 5: Solve for x
    x = 230,625.74/518.78
  6. Step 6: Final answer
    x = 444.55

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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.