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Finding the Fourth Proportional to 991.89, 1,485.81 and 471.15

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Solution

The fourth proportional to 991.89, 1,485.81 and 471.15 is: 705.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.89 : 1,485.81 = 471.15 : x
  2. Step 2: Convert to fraction form
    991.89/1,485.81 = 471.15/x
  3. Step 3: Cross multiply
    991.89x = 1,485.81 × 471.15
  4. Step 4: Simplify right side
    991.89x = 700,039.38
  5. Step 5: Solve for x
    x = 700,039.38/991.89
  6. Step 6: Final answer
    x = 705.76

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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.