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Finding the Fourth Proportional to 1,385.72, 2,078.58 and 1,350.87

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Solution

The fourth proportional to 1,385.72, 2,078.58 and 1,350.87 is: 2,026.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.72 : 2,078.58 = 1,350.87 : x
  2. Step 2: Convert to fraction form
    1,385.72/2,078.58 = 1,350.87/x
  3. Step 3: Cross multiply
    1,385.72x = 2,078.58 × 1,350.87
  4. Step 4: Simplify right side
    1,385.72x = 2,807,888.64
  5. Step 5: Solve for x
    x = 2,807,888.64/1,385.72
  6. Step 6: Final answer
    x = 2,026.30

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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.