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Finding the Fourth Proportional to 684.42, 945.33 and 679.62

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Solution

The fourth proportional to 684.42, 945.33 and 679.62 is: 938.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.42 : 945.33 = 679.62 : x
  2. Step 2: Convert to fraction form
    684.42/945.33 = 679.62/x
  3. Step 3: Cross multiply
    684.42x = 945.33 × 679.62
  4. Step 4: Simplify right side
    684.42x = 642,465.17
  5. Step 5: Solve for x
    x = 642,465.17/684.42
  6. Step 6: Final answer
    x = 938.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.