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Finding the Fourth Proportional to 21,068.76, 31,599.68 and 7,028.90

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Solution

The fourth proportional to 21,068.76, 31,599.68 and 7,028.90 is: 10,542.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,068.76 : 31,599.68 = 7,028.90 : x
  2. Step 2: Convert to fraction form
    21,068.76/31,599.68 = 7,028.90/x
  3. Step 3: Cross multiply
    21,068.76x = 31,599.68 × 7,028.90
  4. Step 4: Simplify right side
    21,068.76x = 222,110,990.75
  5. Step 5: Solve for x
    x = 222,110,990.75/21,068.76
  6. Step 6: Final answer
    x = 10,542.20

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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.