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Finding the Fourth Proportional to 991.92, 1,485.92 and 471.18

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Solution

The fourth proportional to 991.92, 1,485.92 and 471.18 is: 705.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.92 : 1,485.92 = 471.18 : x
  2. Step 2: Convert to fraction form
    991.92/1,485.92 = 471.18/x
  3. Step 3: Cross multiply
    991.92x = 1,485.92 × 471.18
  4. Step 4: Simplify right side
    991.92x = 700,135.79
  5. Step 5: Solve for x
    x = 700,135.79/991.92
  6. Step 6: Final answer
    x = 705.84

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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.