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Finding the Fourth Proportional to 1,220.56, 1,684.02 and 889.10

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Solution

The fourth proportional to 1,220.56, 1,684.02 and 889.10 is: 1,226.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.56 : 1,684.02 = 889.10 : x
  2. Step 2: Convert to fraction form
    1,220.56/1,684.02 = 889.10/x
  3. Step 3: Cross multiply
    1,220.56x = 1,684.02 × 889.10
  4. Step 4: Simplify right side
    1,220.56x = 1,497,262.18
  5. Step 5: Solve for x
    x = 1,497,262.18/1,220.56
  6. Step 6: Final answer
    x = 1,226.70

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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.