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Finding the Fourth Proportional to 991.93, 1,487.77 and 261.56

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Solution

The fourth proportional to 991.93, 1,487.77 and 261.56 is: 392.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.93 : 1,487.77 = 261.56 : x
  2. Step 2: Convert to fraction form
    991.93/1,487.77 = 261.56/x
  3. Step 3: Cross multiply
    991.93x = 1,487.77 × 261.56
  4. Step 4: Simplify right side
    991.93x = 389,141.12
  5. Step 5: Solve for x
    x = 389,141.12/991.93
  6. Step 6: Final answer
    x = 392.31

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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.