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Finding the Fourth Proportional to 687.22, 947.73 and 637.54

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Solution

The fourth proportional to 687.22, 947.73 and 637.54 is: 879.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.22 : 947.73 = 637.54 : x
  2. Step 2: Convert to fraction form
    687.22/947.73 = 637.54/x
  3. Step 3: Cross multiply
    687.22x = 947.73 × 637.54
  4. Step 4: Simplify right side
    687.22x = 604,215.78
  5. Step 5: Solve for x
    x = 604,215.78/687.22
  6. Step 6: Final answer
    x = 879.22

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1.5x scale

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.