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Finding the Fourth Proportional to 684.32, 1,021.30 and 611.36

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Solution

The fourth proportional to 684.32, 1,021.30 and 611.36 is: 912.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.32 : 1,021.30 = 611.36 : x
  2. Step 2: Convert to fraction form
    684.32/1,021.30 = 611.36/x
  3. Step 3: Cross multiply
    684.32x = 1,021.30 × 611.36
  4. Step 4: Simplify right side
    684.32x = 624,381.97
  5. Step 5: Solve for x
    x = 624,381.97/684.32
  6. Step 6: Final answer
    x = 912.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.