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Finding the Fourth Proportional to 15,901.99, 21,949.59 and 9,929.86

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Solution

The fourth proportional to 15,901.99, 21,949.59 and 9,929.86 is: 13,706.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,901.99 : 21,949.59 = 9,929.86 : x
  2. Step 2: Convert to fraction form
    15,901.99/21,949.59 = 9,929.86/x
  3. Step 3: Cross multiply
    15,901.99x = 21,949.59 × 9,929.86
  4. Step 4: Simplify right side
    15,901.99x = 217,956,355.76
  5. Step 5: Solve for x
    x = 217,956,355.76/15,901.99
  6. Step 6: Final answer
    x = 13,706.23

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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.