Home / 1,551.28-2,140.80-921.88

Finding the Fourth Proportional to 1,551.28, 2,140.80 and 921.88

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Solution

The fourth proportional to 1,551.28, 2,140.80 and 921.88 is: 1,272.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.28 : 2,140.80 = 921.88 : x
  2. Step 2: Convert to fraction form
    1,551.28/2,140.80 = 921.88/x
  3. Step 3: Cross multiply
    1,551.28x = 2,140.80 × 921.88
  4. Step 4: Simplify right side
    1,551.28x = 1,973,560.70
  5. Step 5: Solve for x
    x = 1,973,560.70/1,551.28
  6. Step 6: Final answer
    x = 1,272.21

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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.