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Finding the Fourth Proportional to 52,990.40, 79,456.80 and 21,828.80

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Solution

The fourth proportional to 52,990.40, 79,456.80 and 21,828.80 is: 32,731.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,990.40 : 79,456.80 = 21,828.80 : x
  2. Step 2: Convert to fraction form
    52,990.40/79,456.80 = 21,828.80/x
  3. Step 3: Cross multiply
    52,990.40x = 79,456.80 × 21,828.80
  4. Step 4: Simplify right side
    52,990.40x = 1,734,446,595.84
  5. Step 5: Solve for x
    x = 1,734,446,595.84/52,990.40
  6. Step 6: Final answer
    x = 32,731.34

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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.