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Finding the Fourth Proportional to 922.68, 1,381.32 and 678.60

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Solution

The fourth proportional to 922.68, 1,381.32 and 678.60 is: 1,015.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.68 : 1,381.32 = 678.60 : x
  2. Step 2: Convert to fraction form
    922.68/1,381.32 = 678.60/x
  3. Step 3: Cross multiply
    922.68x = 1,381.32 × 678.60
  4. Step 4: Simplify right side
    922.68x = 937,363.75
  5. Step 5: Solve for x
    x = 937,363.75/922.68
  6. Step 6: Final answer
    x = 1,015.91

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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.