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Finding the Fourth Proportional to 992.43, 1,485.57 and 977.85

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Solution

The fourth proportional to 992.43, 1,485.57 and 977.85 is: 1,463.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.43 : 1,485.57 = 977.85 : x
  2. Step 2: Convert to fraction form
    992.43/1,485.57 = 977.85/x
  3. Step 3: Cross multiply
    992.43x = 1,485.57 × 977.85
  4. Step 4: Simplify right side
    992.43x = 1,452,664.62
  5. Step 5: Solve for x
    x = 1,452,664.62/992.43
  6. Step 6: Final answer
    x = 1,463.75

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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.