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Finding the Fourth Proportional to 1,331.95, 1,997.91 and 407.51

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Solution

The fourth proportional to 1,331.95, 1,997.91 and 407.51 is: 611.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.95 : 1,997.91 = 407.51 : x
  2. Step 2: Convert to fraction form
    1,331.95/1,997.91 = 407.51/x
  3. Step 3: Cross multiply
    1,331.95x = 1,997.91 × 407.51
  4. Step 4: Simplify right side
    1,331.95x = 814,159.84
  5. Step 5: Solve for x
    x = 814,159.84/1,331.95
  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.