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Finding the Fourth Proportional to 942.72, 1,299.60 and 662.08

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Solution

The fourth proportional to 942.72, 1,299.60 and 662.08 is: 912.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.72 : 1,299.60 = 662.08 : x
  2. Step 2: Convert to fraction form
    942.72/1,299.60 = 662.08/x
  3. Step 3: Cross multiply
    942.72x = 1,299.60 × 662.08
  4. Step 4: Simplify right side
    942.72x = 860,439.17
  5. Step 5: Solve for x
    x = 860,439.17/942.72
  6. Step 6: Final answer
    x = 912.72

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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.