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Finding the Fourth Proportional to 990.89, 1,485.89 and 528.58

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Solution

The fourth proportional to 990.89, 1,485.89 and 528.58 is: 792.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.89 : 1,485.89 = 528.58 : x
  2. Step 2: Convert to fraction form
    990.89/1,485.89 = 528.58/x
  3. Step 3: Cross multiply
    990.89x = 1,485.89 × 528.58
  4. Step 4: Simplify right side
    990.89x = 785,405.38
  5. Step 5: Solve for x
    x = 785,405.38/990.89
  6. Step 6: Final answer
    x = 792.63

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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.