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Finding the Fourth Proportional to 684.43, 1,026.65 and 520.27

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Solution

The fourth proportional to 684.43, 1,026.65 and 520.27 is: 780.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.43 : 1,026.65 = 520.27 : x
  2. Step 2: Convert to fraction form
    684.43/1,026.65 = 520.27/x
  3. Step 3: Cross multiply
    684.43x = 1,026.65 × 520.27
  4. Step 4: Simplify right side
    684.43x = 534,132.59
  5. Step 5: Solve for x
    x = 534,132.59/684.43
  6. Step 6: Final answer
    x = 780.41

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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.