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Finding the Fourth Proportional to 991.81, 1,486.78 and 471.55

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Solution

The fourth proportional to 991.81, 1,486.78 and 471.55 is: 706.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.81 : 1,486.78 = 471.55 : x
  2. Step 2: Convert to fraction form
    991.81/1,486.78 = 471.55/x
  3. Step 3: Cross multiply
    991.81x = 1,486.78 × 471.55
  4. Step 4: Simplify right side
    991.81x = 701,091.11
  5. Step 5: Solve for x
    x = 701,091.11/991.81
  6. Step 6: Final answer
    x = 706.88

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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.