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Finding the Fourth Proportional to 1,703.78, 2,555.88 and 1,429.20

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Solution

The fourth proportional to 1,703.78, 2,555.88 and 1,429.20 is: 2,143.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,703.78 : 2,555.88 = 1,429.20 : x
  2. Step 2: Convert to fraction form
    1,703.78/2,555.88 = 1,429.20/x
  3. Step 3: Cross multiply
    1,703.78x = 2,555.88 × 1,429.20
  4. Step 4: Simplify right side
    1,703.78x = 3,652,863.70
  5. Step 5: Solve for x
    x = 3,652,863.70/1,703.78
  6. Step 6: Final answer
    x = 2,143.98

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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.