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Finding the Fourth Proportional to 19,929.68, 29,890.44 and 7,447.40

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Solution

The fourth proportional to 19,929.68, 29,890.44 and 7,447.40 is: 11,169.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,929.68 : 29,890.44 = 7,447.40 : x
  2. Step 2: Convert to fraction form
    19,929.68/29,890.44 = 7,447.40/x
  3. Step 3: Cross multiply
    19,929.68x = 29,890.44 × 7,447.40
  4. Step 4: Simplify right side
    19,929.68x = 222,606,062.86
  5. Step 5: Solve for x
    x = 222,606,062.86/19,929.68
  6. Step 6: Final answer
    x = 11,169.58

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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.