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Finding the Fourth Proportional to 1,120.92, 1,680 and 846.15

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Solution

The fourth proportional to 1,120.92, 1,680 and 846.15 is: 1,268.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.92 : 1,680 = 846.15 : x
  2. Step 2: Convert to fraction form
    1,120.92/1,680 = 846.15/x
  3. Step 3: Cross multiply
    1,120.92x = 1,680 × 846.15
  4. Step 4: Simplify right side
    1,120.92x = 1,421,532
  5. Step 5: Solve for x
    x = 1,421,532/1,120.92
  6. Step 6: Final answer
    x = 1,268.18

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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.