Home / 1,221.12-1,681.28-1,065.80

Finding the Fourth Proportional to 1,221.12, 1,681.28 and 1,065.80

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Solution

The fourth proportional to 1,221.12, 1,681.28 and 1,065.80 is: 1,467.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.12 : 1,681.28 = 1,065.80 : x
  2. Step 2: Convert to fraction form
    1,221.12/1,681.28 = 1,065.80/x
  3. Step 3: Cross multiply
    1,221.12x = 1,681.28 × 1,065.80
  4. Step 4: Simplify right side
    1,221.12x = 1,791,908.22
  5. Step 5: Solve for x
    x = 1,791,908.22/1,221.12
  6. Step 6: Final answer
    x = 1,467.43

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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.