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Finding the Fourth Proportional to 3,588.40, 5,381.99 and 991.34

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Solution

The fourth proportional to 3,588.40, 5,381.99 and 991.34 is: 1,486.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,588.40 : 5,381.99 = 991.34 : x
  2. Step 2: Convert to fraction form
    3,588.40/5,381.99 = 991.34/x
  3. Step 3: Cross multiply
    3,588.40x = 5,381.99 × 991.34
  4. Step 4: Simplify right side
    3,588.40x = 5,335,353.82
  5. Step 5: Solve for x
    x = 5,335,353.82/3,588.40
  6. Step 6: Final answer
    x = 1,486.83

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1.5x scale

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.