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Finding the Fourth Proportional to 1,355.76, 2,030.76 and 1,257.84

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Solution

The fourth proportional to 1,355.76, 2,030.76 and 1,257.84 is: 1,884.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.76 : 2,030.76 = 1,257.84 : x
  2. Step 2: Convert to fraction form
    1,355.76/2,030.76 = 1,257.84/x
  3. Step 3: Cross multiply
    1,355.76x = 2,030.76 × 1,257.84
  4. Step 4: Simplify right side
    1,355.76x = 2,554,371.16
  5. Step 5: Solve for x
    x = 2,554,371.16/1,355.76
  6. Step 6: Final answer
    x = 1,884.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.