Home / 1,585.12-2,187.39-921.87

Finding the Fourth Proportional to 1,585.12, 2,187.39 and 921.87

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Solution

The fourth proportional to 1,585.12, 2,187.39 and 921.87 is: 1,272.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.12 : 2,187.39 = 921.87 : x
  2. Step 2: Convert to fraction form
    1,585.12/2,187.39 = 921.87/x
  3. Step 3: Cross multiply
    1,585.12x = 2,187.39 × 921.87
  4. Step 4: Simplify right side
    1,585.12x = 2,016,473.67
  5. Step 5: Solve for x
    x = 2,016,473.67/1,585.12
  6. Step 6: Final answer
    x = 1,272.13

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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.