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Finding the Fourth Proportional to 991.75, 1,487.59 and 406.59

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Solution

The fourth proportional to 991.75, 1,487.59 and 406.59 is: 609.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.75 : 1,487.59 = 406.59 : x
  2. Step 2: Convert to fraction form
    991.75/1,487.59 = 406.59/x
  3. Step 3: Cross multiply
    991.75x = 1,487.59 × 406.59
  4. Step 4: Simplify right side
    991.75x = 604,839.22
  5. Step 5: Solve for x
    x = 604,839.22/991.75
  6. Step 6: Final answer
    x = 609.87

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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.