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Finding the Fourth Proportional to 1,425.78, 2,138.76 and 603.95

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Solution

The fourth proportional to 1,425.78, 2,138.76 and 603.95 is: 905.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.78 : 2,138.76 = 603.95 : x
  2. Step 2: Convert to fraction form
    1,425.78/2,138.76 = 603.95/x
  3. Step 3: Cross multiply
    1,425.78x = 2,138.76 × 603.95
  4. Step 4: Simplify right side
    1,425.78x = 1,291,704.10
  5. Step 5: Solve for x
    x = 1,291,704.10/1,425.78
  6. Step 6: Final answer
    x = 905.96

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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.