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Finding the Fourth Proportional to 510.81, 766.45 and 218.40

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Solution

The fourth proportional to 510.81, 766.45 and 218.40 is: 327.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.81 : 766.45 = 218.40 : x
  2. Step 2: Convert to fraction form
    510.81/766.45 = 218.40/x
  3. Step 3: Cross multiply
    510.81x = 766.45 × 218.40
  4. Step 4: Simplify right side
    510.81x = 167,392.95
  5. Step 5: Solve for x
    x = 167,392.95/510.81
  6. Step 6: Final answer
    x = 327.70

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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.