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Finding the Fourth Proportional to 918.68, 1,380.64 and 856.32

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Solution

The fourth proportional to 918.68, 1,380.64 and 856.32 is: 1,286.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.68 : 1,380.64 = 856.32 : x
  2. Step 2: Convert to fraction form
    918.68/1,380.64 = 856.32/x
  3. Step 3: Cross multiply
    918.68x = 1,380.64 × 856.32
  4. Step 4: Simplify right side
    918.68x = 1,182,269.64
  5. Step 5: Solve for x
    x = 1,182,269.64/918.68
  6. Step 6: Final answer
    x = 1,286.92

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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.