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Finding the Fourth Proportional to 677.05, 1,015.67 and 214.86

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Solution

The fourth proportional to 677.05, 1,015.67 and 214.86 is: 322.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.05 : 1,015.67 = 214.86 : x
  2. Step 2: Convert to fraction form
    677.05/1,015.67 = 214.86/x
  3. Step 3: Cross multiply
    677.05x = 1,015.67 × 214.86
  4. Step 4: Simplify right side
    677.05x = 218,226.86
  5. Step 5: Solve for x
    x = 218,226.86/677.05
  6. Step 6: Final answer
    x = 322.32

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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.