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Finding the Fourth Proportional to 611.88, 918.03 and 392.61

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Solution

The fourth proportional to 611.88, 918.03 and 392.61 is: 589.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.88 : 918.03 = 392.61 : x
  2. Step 2: Convert to fraction form
    611.88/918.03 = 392.61/x
  3. Step 3: Cross multiply
    611.88x = 918.03 × 392.61
  4. Step 4: Simplify right side
    611.88x = 360,427.76
  5. Step 5: Solve for x
    x = 360,427.76/611.88
  6. Step 6: Final answer
    x = 589.05

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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.