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Finding the Fourth Proportional to 518.55, 715.61 and 282.50

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Solution

The fourth proportional to 518.55, 715.61 and 282.50 is: 389.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.55 : 715.61 = 282.50 : x
  2. Step 2: Convert to fraction form
    518.55/715.61 = 282.50/x
  3. Step 3: Cross multiply
    518.55x = 715.61 × 282.50
  4. Step 4: Simplify right side
    518.55x = 202,161.61
  5. Step 5: Solve for x
    x = 202,161.61/518.55
  6. Step 6: Final answer
    x = 389.86

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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.