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Finding the Fourth Proportional to 1,272.91, 1,909.57 and 623.70

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Solution

The fourth proportional to 1,272.91, 1,909.57 and 623.70 is: 935.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.91 : 1,909.57 = 623.70 : x
  2. Step 2: Convert to fraction form
    1,272.91/1,909.57 = 623.70/x
  3. Step 3: Cross multiply
    1,272.91x = 1,909.57 × 623.70
  4. Step 4: Simplify right side
    1,272.91x = 1,190,989.26
  5. Step 5: Solve for x
    x = 1,190,989.26/1,272.91
  6. Step 6: Final answer
    x = 935.64

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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.