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Finding the Fourth Proportional to 861, 1,291.76 and 496.05

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Solution

The fourth proportional to 861, 1,291.76 and 496.05 is: 744.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    861 : 1,291.76 = 496.05 : x
  2. Step 2: Convert to fraction form
    861/1,291.76 = 496.05/x
  3. Step 3: Cross multiply
    861x = 1,291.76 × 496.05
  4. Step 4: Simplify right side
    861x = 640,775.07
  5. Step 5: Solve for x
    x = 640,775.07/861
  6. Step 6: Final answer
    x = 744.22

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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.