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Finding the Fourth Proportional to 11,901.40, 16,424.13 and 7,188.40

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Solution

The fourth proportional to 11,901.40, 16,424.13 and 7,188.40 is: 9,920.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,901.40 : 16,424.13 = 7,188.40 : x
  2. Step 2: Convert to fraction form
    11,901.40/16,424.13 = 7,188.40/x
  3. Step 3: Cross multiply
    11,901.40x = 16,424.13 × 7,188.40
  4. Step 4: Simplify right side
    11,901.40x = 118,063,216.09
  5. Step 5: Solve for x
    x = 118,063,216.09/11,901.40
  6. Step 6: Final answer
    x = 9,920.11

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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.