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Finding the Fourth Proportional to 1,091.50, 1,637.25 and 407.50

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Solution

The fourth proportional to 1,091.50, 1,637.25 and 407.50 is: 611.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.50 : 1,637.25 = 407.50 : x
  2. Step 2: Convert to fraction form
    1,091.50/1,637.25 = 407.50/x
  3. Step 3: Cross multiply
    1,091.50x = 1,637.25 × 407.50
  4. Step 4: Simplify right side
    1,091.50x = 667,179.38
  5. Step 5: Solve for x
    x = 667,179.38/1,091.50
  6. Step 6: Final answer
    x = 611.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.