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Finding the Fourth Proportional to 11,388.61, 15,720.11 and 7,805.71

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Solution

The fourth proportional to 11,388.61, 15,720.11 and 7,805.71 is: 10,774.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,388.61 : 15,720.11 = 7,805.71 : x
  2. Step 2: Convert to fraction form
    11,388.61/15,720.11 = 7,805.71/x
  3. Step 3: Cross multiply
    11,388.61x = 15,720.11 × 7,805.71
  4. Step 4: Simplify right side
    11,388.61x = 122,706,619.83
  5. Step 5: Solve for x
    x = 122,706,619.83/11,388.61
  6. Step 6: Final answer
    x = 10,774.50

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1.5x scale

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.