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Finding the Fourth Proportional to 990.13, 1,485.85 and 528.24

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Solution

The fourth proportional to 990.13, 1,485.85 and 528.24 is: 792.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.13 : 1,485.85 = 528.24 : x
  2. Step 2: Convert to fraction form
    990.13/1,485.85 = 528.24/x
  3. Step 3: Cross multiply
    990.13x = 1,485.85 × 528.24
  4. Step 4: Simplify right side
    990.13x = 784,885.40
  5. Step 5: Solve for x
    x = 784,885.40/990.13
  6. Step 6: Final answer
    x = 792.71

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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.