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Finding the Fourth Proportional to 1,599.49, 2,207.28 and 891.31

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Solution

The fourth proportional to 1,599.49, 2,207.28 and 891.31 is: 1,230.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,599.49 : 2,207.28 = 891.31 : x
  2. Step 2: Convert to fraction form
    1,599.49/2,207.28 = 891.31/x
  3. Step 3: Cross multiply
    1,599.49x = 2,207.28 × 891.31
  4. Step 4: Simplify right side
    1,599.49x = 1,967,370.74
  5. Step 5: Solve for x
    x = 1,967,370.74/1,599.49
  6. Step 6: Final answer
    x = 1,230.00

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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.