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Finding the Fourth Proportional to 687.22, 947.72 and 547.80

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Solution

The fourth proportional to 687.22, 947.72 and 547.80 is: 755.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.22 : 947.72 = 547.80 : x
  2. Step 2: Convert to fraction form
    687.22/947.72 = 547.80/x
  3. Step 3: Cross multiply
    687.22x = 947.72 × 547.80
  4. Step 4: Simplify right side
    687.22x = 519,161.02
  5. Step 5: Solve for x
    x = 519,161.02/687.22
  6. Step 6: Final answer
    x = 755.45

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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.