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Finding the Fourth Proportional to 7,909.72, 11,838.85 and 5,828.90

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Solution

The fourth proportional to 7,909.72, 11,838.85 and 5,828.90 is: 8,724.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,909.72 : 11,838.85 = 5,828.90 : x
  2. Step 2: Convert to fraction form
    7,909.72/11,838.85 = 5,828.90/x
  3. Step 3: Cross multiply
    7,909.72x = 11,838.85 × 5,828.90
  4. Step 4: Simplify right side
    7,909.72x = 69,007,472.77
  5. Step 5: Solve for x
    x = 69,007,472.77/7,909.72
  6. Step 6: Final answer
    x = 8,724.39

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1.5x scale

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.