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Finding the Fourth Proportional to 1,120.64, 1,680.04 and 878.24

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Solution

The fourth proportional to 1,120.64, 1,680.04 and 878.24 is: 1,316.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.64 : 1,680.04 = 878.24 : x
  2. Step 2: Convert to fraction form
    1,120.64/1,680.04 = 878.24/x
  3. Step 3: Cross multiply
    1,120.64x = 1,680.04 × 878.24
  4. Step 4: Simplify right side
    1,120.64x = 1,475,483.63
  5. Step 5: Solve for x
    x = 1,475,483.63/1,120.64
  6. Step 6: Final answer
    x = 1,316.65

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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.