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Finding the Fourth Proportional to 72,930.64, 109,352.16 and 28,504.43

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Solution

The fourth proportional to 72,930.64, 109,352.16 and 28,504.43 is: 42,739.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,930.64 : 109,352.16 = 28,504.43 : x
  2. Step 2: Convert to fraction form
    72,930.64/109,352.16 = 28,504.43/x
  3. Step 3: Cross multiply
    72,930.64x = 109,352.16 × 28,504.43
  4. Step 4: Simplify right side
    72,930.64x = 3,117,020,990.07
  5. Step 5: Solve for x
    x = 3,117,020,990.07/72,930.64
  6. Step 6: Final answer
    x = 42,739.53

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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.