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Finding the Fourth Proportional to 1,458.80, 2,189.76 and 809.36

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Solution

The fourth proportional to 1,458.80, 2,189.76 and 809.36 is: 1,214.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,458.80 : 2,189.76 = 809.36 : x
  2. Step 2: Convert to fraction form
    1,458.80/2,189.76 = 809.36/x
  3. Step 3: Cross multiply
    1,458.80x = 2,189.76 × 809.36
  4. Step 4: Simplify right side
    1,458.80x = 1,772,304.15
  5. Step 5: Solve for x
    x = 1,772,304.15/1,458.80
  6. Step 6: Final answer
    x = 1,214.91

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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.