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Finding the Fourth Proportional to 990.11, 1,485.95 and 435.24

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Solution

The fourth proportional to 990.11, 1,485.95 and 435.24 is: 653.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.11 : 1,485.95 = 435.24 : x
  2. Step 2: Convert to fraction form
    990.11/1,485.95 = 435.24/x
  3. Step 3: Cross multiply
    990.11x = 1,485.95 × 435.24
  4. Step 4: Simplify right side
    990.11x = 646,736.43
  5. Step 5: Solve for x
    x = 646,736.43/990.11
  6. Step 6: Final answer
    x = 653.20

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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.