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Finding the Fourth Proportional to 118,689.28, 163,784.88 and 64,963.88

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Solution

The fourth proportional to 118,689.28, 163,784.88 and 64,963.88 is: 89,646.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,689.28 : 163,784.88 = 64,963.88 : x
  2. Step 2: Convert to fraction form
    118,689.28/163,784.88 = 64,963.88/x
  3. Step 3: Cross multiply
    118,689.28x = 163,784.88 × 64,963.88
  4. Step 4: Simplify right side
    118,689.28x = 10,640,101,290.13
  5. Step 5: Solve for x
    x = 10,640,101,290.13/118,689.28
  6. Step 6: Final answer
    x = 89,646.69

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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.