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Finding the Fourth Proportional to 21,281.81, 31,922.64 and 21,251.03

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Solution

The fourth proportional to 21,281.81, 31,922.64 and 21,251.03 is: 31,876.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,281.81 : 31,922.64 = 21,251.03 : x
  2. Step 2: Convert to fraction form
    21,281.81/31,922.64 = 21,251.03/x
  3. Step 3: Cross multiply
    21,281.81x = 31,922.64 × 21,251.03
  4. Step 4: Simplify right side
    21,281.81x = 678,388,820.71
  5. Step 5: Solve for x
    x = 678,388,820.71/21,281.81
  6. Step 6: Final answer
    x = 31,876.47

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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.