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Finding the Fourth Proportional to 518.48, 715.50 and 282.41

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Solution

The fourth proportional to 518.48, 715.50 and 282.41 is: 389.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.48 : 715.50 = 282.41 : x
  2. Step 2: Convert to fraction form
    518.48/715.50 = 282.41/x
  3. Step 3: Cross multiply
    518.48x = 715.50 × 282.41
  4. Step 4: Simplify right side
    518.48x = 202,064.36
  5. Step 5: Solve for x
    x = 202,064.36/518.48
  6. Step 6: Final answer
    x = 389.72

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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.