Home / 1,551.09-2,140.40-921.59

Finding the Fourth Proportional to 1,551.09, 2,140.40 and 921.59

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Solution

The fourth proportional to 1,551.09, 2,140.40 and 921.59 is: 1,271.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.09 : 2,140.40 = 921.59 : x
  2. Step 2: Convert to fraction form
    1,551.09/2,140.40 = 921.59/x
  3. Step 3: Cross multiply
    1,551.09x = 2,140.40 × 921.59
  4. Step 4: Simplify right side
    1,551.09x = 1,972,571.24
  5. Step 5: Solve for x
    x = 1,972,571.24/1,551.09
  6. Step 6: Final answer
    x = 1,271.73

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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.