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Finding the Fourth Proportional to 78,717.80, 118,076.70 and 43,288.40

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Solution

The fourth proportional to 78,717.80, 118,076.70 and 43,288.40 is: 64,932.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,717.80 : 118,076.70 = 43,288.40 : x
  2. Step 2: Convert to fraction form
    78,717.80/118,076.70 = 43,288.40/x
  3. Step 3: Cross multiply
    78,717.80x = 118,076.70 × 43,288.40
  4. Step 4: Simplify right side
    78,717.80x = 5,111,351,420.28
  5. Step 5: Solve for x
    x = 5,111,351,420.28/78,717.80
  6. Step 6: Final answer
    x = 64,932.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.