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Finding the Fourth Proportional to 1,271.17, 1,905.67 and 925.57

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Solution

The fourth proportional to 1,271.17, 1,905.67 and 925.57 is: 1,387.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.17 : 1,905.67 = 925.57 : x
  2. Step 2: Convert to fraction form
    1,271.17/1,905.67 = 925.57/x
  3. Step 3: Cross multiply
    1,271.17x = 1,905.67 × 925.57
  4. Step 4: Simplify right side
    1,271.17x = 1,763,830.98
  5. Step 5: Solve for x
    x = 1,763,830.98/1,271.17
  6. Step 6: Final answer
    x = 1,387.56

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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.