Home / 1,538.77-2,118.45-1,289.70

Finding the Fourth Proportional to 1,538.77, 2,118.45 and 1,289.70

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Solution

The fourth proportional to 1,538.77, 2,118.45 and 1,289.70 is: 1,775.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.77 : 2,118.45 = 1,289.70 : x
  2. Step 2: Convert to fraction form
    1,538.77/2,118.45 = 1,289.70/x
  3. Step 3: Cross multiply
    1,538.77x = 2,118.45 × 1,289.70
  4. Step 4: Simplify right side
    1,538.77x = 2,732,164.97
  5. Step 5: Solve for x
    x = 2,732,164.97/1,538.77
  6. Step 6: Final answer
    x = 1,775.55

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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.