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Finding the Fourth Proportional to 518.51, 715.54 and 282.45

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Solution

The fourth proportional to 518.51, 715.54 and 282.45 is: 389.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.51 : 715.54 = 282.45 : x
  2. Step 2: Convert to fraction form
    518.51/715.54 = 282.45/x
  3. Step 3: Cross multiply
    518.51x = 715.54 × 282.45
  4. Step 4: Simplify right side
    518.51x = 202,105.36
  5. Step 5: Solve for x
    x = 202,105.36/518.51
  6. Step 6: Final answer
    x = 389.78

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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.