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Finding the Fourth Proportional to 1,645.61, 2,270.96 and 899.60

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Solution

The fourth proportional to 1,645.61, 2,270.96 and 899.60 is: 1,241.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.61 : 2,270.96 = 899.60 : x
  2. Step 2: Convert to fraction form
    1,645.61/2,270.96 = 899.60/x
  3. Step 3: Cross multiply
    1,645.61x = 2,270.96 × 899.60
  4. Step 4: Simplify right side
    1,645.61x = 2,042,939.76
  5. Step 5: Solve for x
    x = 2,042,939.76/1,645.61
  6. Step 6: Final answer
    x = 1,241.45

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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.