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Finding the Fourth Proportional to 518.70, 777.81 and 210.45

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Solution

The fourth proportional to 518.70, 777.81 and 210.45 is: 315.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.70 : 777.81 = 210.45 : x
  2. Step 2: Convert to fraction form
    518.70/777.81 = 210.45/x
  3. Step 3: Cross multiply
    518.70x = 777.81 × 210.45
  4. Step 4: Simplify right side
    518.70x = 163,690.11
  5. Step 5: Solve for x
    x = 163,690.11/518.70
  6. Step 6: Final answer
    x = 315.58

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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.