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Finding the Fourth Proportional to 78,640.48, 108,523.20 and 54,780.40

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Solution

The fourth proportional to 78,640.48, 108,523.20 and 54,780.40 is: 75,596.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,640.48 : 108,523.20 = 54,780.40 : x
  2. Step 2: Convert to fraction form
    78,640.48/108,523.20 = 54,780.40/x
  3. Step 3: Cross multiply
    78,640.48x = 108,523.20 × 54,780.40
  4. Step 4: Simplify right side
    78,640.48x = 5,944,944,305.28
  5. Step 5: Solve for x
    x = 5,944,944,305.28/78,640.48
  6. Step 6: Final answer
    x = 75,596.49

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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.