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Finding the Fourth Proportional to 977.90, 1,467.62 and 515.95

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Solution

The fourth proportional to 977.90, 1,467.62 and 515.95 is: 774.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.90 : 1,467.62 = 515.95 : x
  2. Step 2: Convert to fraction form
    977.90/1,467.62 = 515.95/x
  3. Step 3: Cross multiply
    977.90x = 1,467.62 × 515.95
  4. Step 4: Simplify right side
    977.90x = 757,218.54
  5. Step 5: Solve for x
    x = 757,218.54/977.90
  6. Step 6: Final answer
    x = 774.33

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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.