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Finding the Fourth Proportional to 518.17, 777.50 and 258.16

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Solution

The fourth proportional to 518.17, 777.50 and 258.16 is: 387.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.17 : 777.50 = 258.16 : x
  2. Step 2: Convert to fraction form
    518.17/777.50 = 258.16/x
  3. Step 3: Cross multiply
    518.17x = 777.50 × 258.16
  4. Step 4: Simplify right side
    518.17x = 200,718.11
  5. Step 5: Solve for x
    x = 200,718.11/518.17
  6. Step 6: Final answer
    x = 387.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.