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Finding the Fourth Proportional to 992.90, 1,489.35 and 685.10

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Solution

The fourth proportional to 992.90, 1,489.35 and 685.10 is: 1,027.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.90 : 1,489.35 = 685.10 : x
  2. Step 2: Convert to fraction form
    992.90/1,489.35 = 685.10/x
  3. Step 3: Cross multiply
    992.90x = 1,489.35 × 685.10
  4. Step 4: Simplify right side
    992.90x = 1,020,353.69
  5. Step 5: Solve for x
    x = 1,020,353.69/992.90
  6. Step 6: Final answer
    x = 1,027.65

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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.