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Finding the Fourth Proportional to 990.76, 1,485.36 and 471.08

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Solution

The fourth proportional to 990.76, 1,485.36 and 471.08 is: 706.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.76 : 1,485.36 = 471.08 : x
  2. Step 2: Convert to fraction form
    990.76/1,485.36 = 471.08/x
  3. Step 3: Cross multiply
    990.76x = 1,485.36 × 471.08
  4. Step 4: Simplify right side
    990.76x = 699,723.39
  5. Step 5: Solve for x
    x = 699,723.39/990.76
  6. Step 6: Final answer
    x = 706.25

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Double scale
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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.