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Finding the Fourth Proportional to 57,868.80, 86,807.04 and 20,928

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Solution

The fourth proportional to 57,868.80, 86,807.04 and 20,928 is: 31,393.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,868.80 : 86,807.04 = 20,928 : x
  2. Step 2: Convert to fraction form
    57,868.80/86,807.04 = 20,928/x
  3. Step 3: Cross multiply
    57,868.80x = 86,807.04 × 20,928
  4. Step 4: Simplify right side
    57,868.80x = 1,816,697,733.12
  5. Step 5: Solve for x
    x = 1,816,697,733.12/57,868.80
  6. Step 6: Final answer
    x = 31,393.39

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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.