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Finding the Fourth Proportional to 990.24, 1,485.44 and 579.44

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Solution

The fourth proportional to 990.24, 1,485.44 and 579.44 is: 869.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.24 : 1,485.44 = 579.44 : x
  2. Step 2: Convert to fraction form
    990.24/1,485.44 = 579.44/x
  3. Step 3: Cross multiply
    990.24x = 1,485.44 × 579.44
  4. Step 4: Simplify right side
    990.24x = 860,713.03
  5. Step 5: Solve for x
    x = 860,713.03/990.24
  6. Step 6: Final answer
    x = 869.20

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Double scale
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1.5x scale

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.