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Finding the Fourth Proportional to 677.45, 1,015.72 and 330.87

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Solution

The fourth proportional to 677.45, 1,015.72 and 330.87 is: 496.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.45 : 1,015.72 = 330.87 : x
  2. Step 2: Convert to fraction form
    677.45/1,015.72 = 330.87/x
  3. Step 3: Cross multiply
    677.45x = 1,015.72 × 330.87
  4. Step 4: Simplify right side
    677.45x = 336,071.28
  5. Step 5: Solve for x
    x = 336,071.28/677.45
  6. Step 6: Final answer
    x = 496.08

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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.