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Finding the Fourth Proportional to 611.81, 918.11 and 392.59

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Solution

The fourth proportional to 611.81, 918.11 and 392.59 is: 589.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.81 : 918.11 = 392.59 : x
  2. Step 2: Convert to fraction form
    611.81/918.11 = 392.59/x
  3. Step 3: Cross multiply
    611.81x = 918.11 × 392.59
  4. Step 4: Simplify right side
    611.81x = 360,440.80
  5. Step 5: Solve for x
    x = 360,440.80/611.81
  6. Step 6: Final answer
    x = 589.14

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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.