Home / 1,511.68-2,086.17-921.80

Finding the Fourth Proportional to 1,511.68, 2,086.17 and 921.80

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Solution

The fourth proportional to 1,511.68, 2,086.17 and 921.80 is: 1,272.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.68 : 2,086.17 = 921.80 : x
  2. Step 2: Convert to fraction form
    1,511.68/2,086.17 = 921.80/x
  3. Step 3: Cross multiply
    1,511.68x = 2,086.17 × 921.80
  4. Step 4: Simplify right side
    1,511.68x = 1,923,031.51
  5. Step 5: Solve for x
    x = 1,923,031.51/1,511.68
  6. Step 6: Final answer
    x = 1,272.12

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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.