Home / 2,153.79-3,231.50-921.51

Finding the Fourth Proportional to 2,153.79, 3,231.50 and 921.51

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Solution

The fourth proportional to 2,153.79, 3,231.50 and 921.51 is: 1,382.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.79 : 3,231.50 = 921.51 : x
  2. Step 2: Convert to fraction form
    2,153.79/3,231.50 = 921.51/x
  3. Step 3: Cross multiply
    2,153.79x = 3,231.50 × 921.51
  4. Step 4: Simplify right side
    2,153.79x = 2,977,854.96
  5. Step 5: Solve for x
    x = 2,977,854.96/2,153.79
  6. Step 6: Final answer
    x = 1,382.61

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1.5x scale

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.