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Finding the Fourth Proportional to 990.31, 1,486.37 and 528.48

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Solution

The fourth proportional to 990.31, 1,486.37 and 528.48 is: 793.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.31 : 1,486.37 = 528.48 : x
  2. Step 2: Convert to fraction form
    990.31/1,486.37 = 528.48/x
  3. Step 3: Cross multiply
    990.31x = 1,486.37 × 528.48
  4. Step 4: Simplify right side
    990.31x = 785,516.82
  5. Step 5: Solve for x
    x = 785,516.82/990.31
  6. Step 6: Final answer
    x = 793.20

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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.