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Finding the Fourth Proportional to 42,974.80, 64,453.80 and 21,621.80

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Solution

The fourth proportional to 42,974.80, 64,453.80 and 21,621.80 is: 32,428.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,974.80 : 64,453.80 = 21,621.80 : x
  2. Step 2: Convert to fraction form
    42,974.80/64,453.80 = 21,621.80/x
  3. Step 3: Cross multiply
    42,974.80x = 64,453.80 × 21,621.80
  4. Step 4: Simplify right side
    42,974.80x = 1,393,607,172.84
  5. Step 5: Solve for x
    x = 1,393,607,172.84/42,974.80
  6. Step 6: Final answer
    x = 32,428.47

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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.