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Finding the Fourth Proportional to 518.77, 715.74 and 308.98

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Solution

The fourth proportional to 518.77, 715.74 and 308.98 is: 426.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.77 : 715.74 = 308.98 : x
  2. Step 2: Convert to fraction form
    518.77/715.74 = 308.98/x
  3. Step 3: Cross multiply
    518.77x = 715.74 × 308.98
  4. Step 4: Simplify right side
    518.77x = 221,149.08
  5. Step 5: Solve for x
    x = 221,149.08/518.77
  6. Step 6: Final answer
    x = 426.29

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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.