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Finding the Fourth Proportional to 991.72, 1,487.73 and 261.35

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Solution

The fourth proportional to 991.72, 1,487.73 and 261.35 is: 392.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.72 : 1,487.73 = 261.35 : x
  2. Step 2: Convert to fraction form
    991.72/1,487.73 = 261.35/x
  3. Step 3: Cross multiply
    991.72x = 1,487.73 × 261.35
  4. Step 4: Simplify right side
    991.72x = 388,825.72
  5. Step 5: Solve for x
    x = 388,825.72/991.72
  6. Step 6: Final answer
    x = 392.07

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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.