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Finding the Fourth Proportional to 926.80, 1,279.08 and 898.09

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Solution

The fourth proportional to 926.80, 1,279.08 and 898.09 is: 1,239.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.80 : 1,279.08 = 898.09 : x
  2. Step 2: Convert to fraction form
    926.80/1,279.08 = 898.09/x
  3. Step 3: Cross multiply
    926.80x = 1,279.08 × 898.09
  4. Step 4: Simplify right side
    926.80x = 1,148,728.96
  5. Step 5: Solve for x
    x = 1,148,728.96/926.80
  6. Step 6: Final answer
    x = 1,239.46

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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.