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Finding the Fourth Proportional to 515.15, 772.82 and 207.02

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Solution

The fourth proportional to 515.15, 772.82 and 207.02 is: 310.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.15 : 772.82 = 207.02 : x
  2. Step 2: Convert to fraction form
    515.15/772.82 = 207.02/x
  3. Step 3: Cross multiply
    515.15x = 772.82 × 207.02
  4. Step 4: Simplify right side
    515.15x = 159,989.13
  5. Step 5: Solve for x
    x = 159,989.13/515.15
  6. Step 6: Final answer
    x = 310.57

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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.