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Finding the Fourth Proportional to 942.15, 1,299.76 and 646.90

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Solution

The fourth proportional to 942.15, 1,299.76 and 646.90 is: 892.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.15 : 1,299.76 = 646.90 : x
  2. Step 2: Convert to fraction form
    942.15/1,299.76 = 646.90/x
  3. Step 3: Cross multiply
    942.15x = 1,299.76 × 646.90
  4. Step 4: Simplify right side
    942.15x = 840,814.74
  5. Step 5: Solve for x
    x = 840,814.74/942.15
  6. Step 6: Final answer
    x = 892.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.