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Finding the Fourth Proportional to 990.48, 1,485.27 and 579.75

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Solution

The fourth proportional to 990.48, 1,485.27 and 579.75 is: 869.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.48 : 1,485.27 = 579.75 : x
  2. Step 2: Convert to fraction form
    990.48/1,485.27 = 579.75/x
  3. Step 3: Cross multiply
    990.48x = 1,485.27 × 579.75
  4. Step 4: Simplify right side
    990.48x = 861,085.28
  5. Step 5: Solve for x
    x = 861,085.28/990.48
  6. Step 6: Final answer
    x = 869.36

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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.