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Finding the Fourth Proportional to 1,609.30, 2,220.74 and 901.12

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Solution

The fourth proportional to 1,609.30, 2,220.74 and 901.12 is: 1,243.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,609.30 : 2,220.74 = 901.12 : x
  2. Step 2: Convert to fraction form
    1,609.30/2,220.74 = 901.12/x
  3. Step 3: Cross multiply
    1,609.30x = 2,220.74 × 901.12
  4. Step 4: Simplify right side
    1,609.30x = 2,001,153.23
  5. Step 5: Solve for x
    x = 2,001,153.23/1,609.30
  6. Step 6: Final answer
    x = 1,243.49

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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.