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Finding the Fourth Proportional to 920.96, 1,260.76 and 917.92

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Solution

The fourth proportional to 920.96, 1,260.76 and 917.92 is: 1,256.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.96 : 1,260.76 = 917.92 : x
  2. Step 2: Convert to fraction form
    920.96/1,260.76 = 917.92/x
  3. Step 3: Cross multiply
    920.96x = 1,260.76 × 917.92
  4. Step 4: Simplify right side
    920.96x = 1,157,276.82
  5. Step 5: Solve for x
    x = 1,157,276.82/920.96
  6. Step 6: Final answer
    x = 1,256.60

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.