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Finding the Fourth Proportional to 917.92, 1,378.56 and 553.48

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Solution

The fourth proportional to 917.92, 1,378.56 and 553.48 is: 831.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.92 : 1,378.56 = 553.48 : x
  2. Step 2: Convert to fraction form
    917.92/1,378.56 = 553.48/x
  3. Step 3: Cross multiply
    917.92x = 1,378.56 × 553.48
  4. Step 4: Simplify right side
    917.92x = 763,005.39
  5. Step 5: Solve for x
    x = 763,005.39/917.92
  6. Step 6: Final answer
    x = 831.23

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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.