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Finding the Fourth Proportional to 677.36, 1,015.62 and 312.20

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Solution

The fourth proportional to 677.36, 1,015.62 and 312.20 is: 468.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.36 : 1,015.62 = 312.20 : x
  2. Step 2: Convert to fraction form
    677.36/1,015.62 = 312.20/x
  3. Step 3: Cross multiply
    677.36x = 1,015.62 × 312.20
  4. Step 4: Simplify right side
    677.36x = 317,076.56
  5. Step 5: Solve for x
    x = 317,076.56/677.36
  6. Step 6: Final answer
    x = 468.11

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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.