Home / 1,217.40-1,681.56-1,021.92

Finding the Fourth Proportional to 1,217.40, 1,681.56 and 1,021.92

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Solution

The fourth proportional to 1,217.40, 1,681.56 and 1,021.92 is: 1,411.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.40 : 1,681.56 = 1,021.92 : x
  2. Step 2: Convert to fraction form
    1,217.40/1,681.56 = 1,021.92/x
  3. Step 3: Cross multiply
    1,217.40x = 1,681.56 × 1,021.92
  4. Step 4: Simplify right side
    1,217.40x = 1,718,419.80
  5. Step 5: Solve for x
    x = 1,718,419.80/1,217.40
  6. Step 6: Final answer
    x = 1,411.55

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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.