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Finding the Fourth Proportional to 1,272.35, 1,909.23 and 623.09

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Solution

The fourth proportional to 1,272.35, 1,909.23 and 623.09 is: 934.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.35 : 1,909.23 = 623.09 : x
  2. Step 2: Convert to fraction form
    1,272.35/1,909.23 = 623.09/x
  3. Step 3: Cross multiply
    1,272.35x = 1,909.23 × 623.09
  4. Step 4: Simplify right side
    1,272.35x = 1,189,622.12
  5. Step 5: Solve for x
    x = 1,189,622.12/1,272.35
  6. Step 6: Final answer
    x = 934.98

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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.