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Finding the Fourth Proportional to 69,996, 105,042.64 and 28,443.04

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Solution

The fourth proportional to 69,996, 105,042.64 and 28,443.04 is: 42,684.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,996 : 105,042.64 = 28,443.04 : x
  2. Step 2: Convert to fraction form
    69,996/105,042.64 = 28,443.04/x
  3. Step 3: Cross multiply
    69,996x = 105,042.64 × 28,443.04
  4. Step 4: Simplify right side
    69,996x = 2,987,732,011.23
  5. Step 5: Solve for x
    x = 2,987,732,011.23/69,996
  6. Step 6: Final answer
    x = 42,684.32

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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.