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Finding the Fourth Proportional to 917.92, 1,378.56 and 553.36

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Solution

The fourth proportional to 917.92, 1,378.56 and 553.36 is: 831.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.92 : 1,378.56 = 553.36 : x
  2. Step 2: Convert to fraction form
    917.92/1,378.56 = 553.36/x
  3. Step 3: Cross multiply
    917.92x = 1,378.56 × 553.36
  4. Step 4: Simplify right side
    917.92x = 762,839.96
  5. Step 5: Solve for x
    x = 762,839.96/917.92
  6. Step 6: Final answer
    x = 831.05

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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.