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Finding the Fourth Proportional to 873.54, 1,206.12 and 611.91

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Solution

The fourth proportional to 873.54, 1,206.12 and 611.91 is: 844.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.54 : 1,206.12 = 611.91 : x
  2. Step 2: Convert to fraction form
    873.54/1,206.12 = 611.91/x
  3. Step 3: Cross multiply
    873.54x = 1,206.12 × 611.91
  4. Step 4: Simplify right side
    873.54x = 738,036.89
  5. Step 5: Solve for x
    x = 738,036.89/873.54
  6. Step 6: Final answer
    x = 844.88

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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.