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Finding the Fourth Proportional to 684.79, 1,026.45 and 355.40

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Solution

The fourth proportional to 684.79, 1,026.45 and 355.40 is: 532.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.79 : 1,026.45 = 355.40 : x
  2. Step 2: Convert to fraction form
    684.79/1,026.45 = 355.40/x
  3. Step 3: Cross multiply
    684.79x = 1,026.45 × 355.40
  4. Step 4: Simplify right side
    684.79x = 364,793.42
  5. Step 5: Solve for x
    x = 364,793.42/684.79
  6. Step 6: Final answer
    x = 532.71

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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.