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Finding the Fourth Proportional to 942.70, 1,412.43 and 653.80

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Solution

The fourth proportional to 942.70, 1,412.43 and 653.80 is: 979.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.70 : 1,412.43 = 653.80 : x
  2. Step 2: Convert to fraction form
    942.70/1,412.43 = 653.80/x
  3. Step 3: Cross multiply
    942.70x = 1,412.43 × 653.80
  4. Step 4: Simplify right side
    942.70x = 923,446.73
  5. Step 5: Solve for x
    x = 923,446.73/942.70
  6. Step 6: Final answer
    x = 979.58

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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.