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Finding the Fourth Proportional to 947.74, 1,420.29 and 716.44

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Solution

The fourth proportional to 947.74, 1,420.29 and 716.44 is: 1,073.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.74 : 1,420.29 = 716.44 : x
  2. Step 2: Convert to fraction form
    947.74/1,420.29 = 716.44/x
  3. Step 3: Cross multiply
    947.74x = 1,420.29 × 716.44
  4. Step 4: Simplify right side
    947.74x = 1,017,552.57
  5. Step 5: Solve for x
    x = 1,017,552.57/947.74
  6. Step 6: Final answer
    x = 1,073.66

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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.