Home / 1,561.28-2,153.79-1,031.09

Finding the Fourth Proportional to 1,561.28, 2,153.79 and 1,031.09

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Solution

The fourth proportional to 1,561.28, 2,153.79 and 1,031.09 is: 1,422.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.28 : 2,153.79 = 1,031.09 : x
  2. Step 2: Convert to fraction form
    1,561.28/2,153.79 = 1,031.09/x
  3. Step 3: Cross multiply
    1,561.28x = 2,153.79 × 1,031.09
  4. Step 4: Simplify right side
    1,561.28x = 2,220,740.56
  5. Step 5: Solve for x
    x = 2,220,740.56/1,561.28
  6. Step 6: Final answer
    x = 1,422.39

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1.5x scale

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.