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Finding the Fourth Proportional to 684.69, 1,026.90 and 437.78

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Solution

The fourth proportional to 684.69, 1,026.90 and 437.78 is: 656.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.69 : 1,026.90 = 437.78 : x
  2. Step 2: Convert to fraction form
    684.69/1,026.90 = 437.78/x
  3. Step 3: Cross multiply
    684.69x = 1,026.90 × 437.78
  4. Step 4: Simplify right side
    684.69x = 449,551.15
  5. Step 5: Solve for x
    x = 449,551.15/684.69
  6. Step 6: Final answer
    x = 656.58

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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.