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Finding the Fourth Proportional to 518.66, 777.42 and 210.42

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Solution

The fourth proportional to 518.66, 777.42 and 210.42 is: 315.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.66 : 777.42 = 210.42 : x
  2. Step 2: Convert to fraction form
    518.66/777.42 = 210.42/x
  3. Step 3: Cross multiply
    518.66x = 777.42 × 210.42
  4. Step 4: Simplify right side
    518.66x = 163,584.72
  5. Step 5: Solve for x
    x = 163,584.72/518.66
  6. Step 6: Final answer
    x = 315.40

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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.