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Finding the Fourth Proportional to 991.76, 1,487.66 and 261.40

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Solution

The fourth proportional to 991.76, 1,487.66 and 261.40 is: 392.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.76 : 1,487.66 = 261.40 : x
  2. Step 2: Convert to fraction form
    991.76/1,487.66 = 261.40/x
  3. Step 3: Cross multiply
    991.76x = 1,487.66 × 261.40
  4. Step 4: Simplify right side
    991.76x = 388,874.32
  5. Step 5: Solve for x
    x = 388,874.32/991.76
  6. Step 6: Final answer
    x = 392.11

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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.