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Finding the Fourth Proportional to 73,009.20, 109,513.80 and 66,442.80

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Solution

The fourth proportional to 73,009.20, 109,513.80 and 66,442.80 is: 99,664.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,009.20 : 109,513.80 = 66,442.80 : x
  2. Step 2: Convert to fraction form
    73,009.20/109,513.80 = 66,442.80/x
  3. Step 3: Cross multiply
    73,009.20x = 109,513.80 × 66,442.80
  4. Step 4: Simplify right side
    73,009.20x = 7,276,403,510.64
  5. Step 5: Solve for x
    x = 7,276,403,510.64/73,009.20
  6. Step 6: Final answer
    x = 99,664.20

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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.