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Finding the Fourth Proportional to 677.49, 1,015.95 and 215.15

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Solution

The fourth proportional to 677.49, 1,015.95 and 215.15 is: 322.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.49 : 1,015.95 = 215.15 : x
  2. Step 2: Convert to fraction form
    677.49/1,015.95 = 215.15/x
  3. Step 3: Cross multiply
    677.49x = 1,015.95 × 215.15
  4. Step 4: Simplify right side
    677.49x = 218,578.47
  5. Step 5: Solve for x
    x = 218,578.47/677.49
  6. Step 6: Final answer
    x = 322.63

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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.