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Finding the Fourth Proportional to 57,391.40, 79,172.80 and 38,280

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Solution

The fourth proportional to 57,391.40, 79,172.80 and 38,280 is: 52,808.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,391.40 : 79,172.80 = 38,280 : x
  2. Step 2: Convert to fraction form
    57,391.40/79,172.80 = 38,280/x
  3. Step 3: Cross multiply
    57,391.40x = 79,172.80 × 38,280
  4. Step 4: Simplify right side
    57,391.40x = 3,030,734,784
  5. Step 5: Solve for x
    x = 3,030,734,784/57,391.40
  6. Step 6: Final answer
    x = 52,808.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.