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Finding the Fourth Proportional to 118,396.76, 163,398.78 and 64,689.84

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Solution

The fourth proportional to 118,396.76, 163,398.78 and 64,689.84 is: 89,278.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,396.76 : 163,398.78 = 64,689.84 : x
  2. Step 2: Convert to fraction form
    118,396.76/163,398.78 = 64,689.84/x
  3. Step 3: Cross multiply
    118,396.76x = 163,398.78 × 64,689.84
  4. Step 4: Simplify right side
    118,396.76x = 10,570,240,934.40
  5. Step 5: Solve for x
    x = 10,570,240,934.40/118,396.76
  6. Step 6: Final answer
    x = 89,278.13

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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.