Home / 1,977.40-2,729.38-1,388.08

Finding the Fourth Proportional to 1,977.40, 2,729.38 and 1,388.08

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Solution

The fourth proportional to 1,977.40, 2,729.38 and 1,388.08 is: 1,915.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,977.40 : 2,729.38 = 1,388.08 : x
  2. Step 2: Convert to fraction form
    1,977.40/2,729.38 = 1,388.08/x
  3. Step 3: Cross multiply
    1,977.40x = 2,729.38 × 1,388.08
  4. Step 4: Simplify right side
    1,977.40x = 3,788,597.79
  5. Step 5: Solve for x
    x = 3,788,597.79/1,977.40
  6. Step 6: Final answer
    x = 1,915.95

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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.