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Finding the Fourth Proportional to 118,143.80, 163,038.68 and 64,429.20

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Solution

The fourth proportional to 118,143.80, 163,038.68 and 64,429.20 is: 88,912.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,143.80 : 163,038.68 = 64,429.20 : x
  2. Step 2: Convert to fraction form
    118,143.80/163,038.68 = 64,429.20/x
  3. Step 3: Cross multiply
    118,143.80x = 163,038.68 × 64,429.20
  4. Step 4: Simplify right side
    118,143.80x = 10,504,451,721.46
  5. Step 5: Solve for x
    x = 10,504,451,721.46/118,143.80
  6. Step 6: Final answer
    x = 88,912.42

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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.