Home / 1,585.20-2,187.32-921.92

Finding the Fourth Proportional to 1,585.20, 2,187.32 and 921.92

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Solution

The fourth proportional to 1,585.20, 2,187.32 and 921.92 is: 1,272.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.20 : 2,187.32 = 921.92 : x
  2. Step 2: Convert to fraction form
    1,585.20/2,187.32 = 921.92/x
  3. Step 3: Cross multiply
    1,585.20x = 2,187.32 × 921.92
  4. Step 4: Simplify right side
    1,585.20x = 2,016,534.05
  5. Step 5: Solve for x
    x = 2,016,534.05/1,585.20
  6. Step 6: Final answer
    x = 1,272.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.