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Finding the Fourth Proportional to 21,065.85, 31,602.01 and 7,919.14

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Solution

The fourth proportional to 21,065.85, 31,602.01 and 7,919.14 is: 11,879.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,065.85 : 31,602.01 = 7,919.14 : x
  2. Step 2: Convert to fraction form
    21,065.85/31,602.01 = 7,919.14/x
  3. Step 3: Cross multiply
    21,065.85x = 31,602.01 × 7,919.14
  4. Step 4: Simplify right side
    21,065.85x = 250,260,741.47
  5. Step 5: Solve for x
    x = 250,260,741.47/21,065.85
  6. Step 6: Final answer
    x = 11,879.93

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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.