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Finding the Fourth Proportional to 1,223.79, 1,836.06 and 390.97

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Solution

The fourth proportional to 1,223.79, 1,836.06 and 390.97 is: 586.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.79 : 1,836.06 = 390.97 : x
  2. Step 2: Convert to fraction form
    1,223.79/1,836.06 = 390.97/x
  3. Step 3: Cross multiply
    1,223.79x = 1,836.06 × 390.97
  4. Step 4: Simplify right side
    1,223.79x = 717,844.38
  5. Step 5: Solve for x
    x = 717,844.38/1,223.79
  6. Step 6: Final answer
    x = 586.57

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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.