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Finding the Fourth Proportional to 1,290.62, 1,781.09 and 723.50

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Solution

The fourth proportional to 1,290.62, 1,781.09 and 723.50 is: 998.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.62 : 1,781.09 = 723.50 : x
  2. Step 2: Convert to fraction form
    1,290.62/1,781.09 = 723.50/x
  3. Step 3: Cross multiply
    1,290.62x = 1,781.09 × 723.50
  4. Step 4: Simplify right side
    1,290.62x = 1,288,618.62
  5. Step 5: Solve for x
    x = 1,288,618.62/1,290.62
  6. Step 6: Final answer
    x = 998.45

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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.