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Finding the Fourth Proportional to 677.19, 1,015.40 and 311.62

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Solution

The fourth proportional to 677.19, 1,015.40 and 311.62 is: 467.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.19 : 1,015.40 = 311.62 : x
  2. Step 2: Convert to fraction form
    677.19/1,015.40 = 311.62/x
  3. Step 3: Cross multiply
    677.19x = 1,015.40 × 311.62
  4. Step 4: Simplify right side
    677.19x = 316,420.63
  5. Step 5: Solve for x
    x = 316,420.63/677.19
  6. Step 6: Final answer
    x = 467.26

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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.