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Finding the Fourth Proportional to 1,539, 2,123.97 and 909.72

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Solution

The fourth proportional to 1,539, 2,123.97 and 909.72 is: 1,255.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539 : 2,123.97 = 909.72 : x
  2. Step 2: Convert to fraction form
    1,539/2,123.97 = 909.72/x
  3. Step 3: Cross multiply
    1,539x = 2,123.97 × 909.72
  4. Step 4: Simplify right side
    1,539x = 1,932,217.99
  5. Step 5: Solve for x
    x = 1,932,217.99/1,539
  6. Step 6: Final answer
    x = 1,255.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.