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Finding the Fourth Proportional to 677.18, 1,015.78 and 433.86

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Solution

The fourth proportional to 677.18, 1,015.78 and 433.86 is: 650.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.18 : 1,015.78 = 433.86 : x
  2. Step 2: Convert to fraction form
    677.18/1,015.78 = 433.86/x
  3. Step 3: Cross multiply
    677.18x = 1,015.78 × 433.86
  4. Step 4: Simplify right side
    677.18x = 440,706.31
  5. Step 5: Solve for x
    x = 440,706.31/677.18
  6. Step 6: Final answer
    x = 650.80

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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.