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Finding the Fourth Proportional to 879.92, 1,212.89 and 693.12

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Solution

The fourth proportional to 879.92, 1,212.89 and 693.12 is: 955.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.92 : 1,212.89 = 693.12 : x
  2. Step 2: Convert to fraction form
    879.92/1,212.89 = 693.12/x
  3. Step 3: Cross multiply
    879.92x = 1,212.89 × 693.12
  4. Step 4: Simplify right side
    879.92x = 840,674.85
  5. Step 5: Solve for x
    x = 840,674.85/879.92
  6. Step 6: Final answer
    x = 955.40

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Double scale
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1.5x scale

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.