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Finding the Fourth Proportional to 118,716.48, 163,939.92 and 76,348.80

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Solution

The fourth proportional to 118,716.48, 163,939.92 and 76,348.80 is: 105,432.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,716.48 : 163,939.92 = 76,348.80 : x
  2. Step 2: Convert to fraction form
    118,716.48/163,939.92 = 76,348.80/x
  3. Step 3: Cross multiply
    118,716.48x = 163,939.92 × 76,348.80
  4. Step 4: Simplify right side
    118,716.48x = 12,516,616,164.10
  5. Step 5: Solve for x
    x = 12,516,616,164.10/118,716.48
  6. Step 6: Final answer
    x = 105,432.84

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1.5x scale

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.