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Finding the Fourth Proportional to 889.56, 1,228.69 and 628.74

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Solution

The fourth proportional to 889.56, 1,228.69 and 628.74 is: 868.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.56 : 1,228.69 = 628.74 : x
  2. Step 2: Convert to fraction form
    889.56/1,228.69 = 628.74/x
  3. Step 3: Cross multiply
    889.56x = 1,228.69 × 628.74
  4. Step 4: Simplify right side
    889.56x = 772,526.55
  5. Step 5: Solve for x
    x = 772,526.55/889.56
  6. Step 6: Final answer
    x = 868.44

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Double scale
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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.