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Finding the Fourth Proportional to 21,099.68, 31,651.18 and 7,059.78

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Solution

The fourth proportional to 21,099.68, 31,651.18 and 7,059.78 is: 10,590.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,099.68 : 31,651.18 = 7,059.78 : x
  2. Step 2: Convert to fraction form
    21,099.68/31,651.18 = 7,059.78/x
  3. Step 3: Cross multiply
    21,099.68x = 31,651.18 × 7,059.78
  4. Step 4: Simplify right side
    21,099.68x = 223,450,270.91
  5. Step 5: Solve for x
    x = 223,450,270.91/21,099.68
  6. Step 6: Final answer
    x = 10,590.22

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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.