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Finding the Fourth Proportional to 873.98, 1,206.15 and 611.90

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Solution

The fourth proportional to 873.98, 1,206.15 and 611.90 is: 844.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.98 : 1,206.15 = 611.90 : x
  2. Step 2: Convert to fraction form
    873.98/1,206.15 = 611.90/x
  3. Step 3: Cross multiply
    873.98x = 1,206.15 × 611.90
  4. Step 4: Simplify right side
    873.98x = 738,043.19
  5. Step 5: Solve for x
    x = 738,043.19/873.98
  6. Step 6: Final answer
    x = 844.46

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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.