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Finding the Fourth Proportional to 72,060.76, 99,393.78 and 66,112.12

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Solution

The fourth proportional to 72,060.76, 99,393.78 and 66,112.12 is: 91,188.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,060.76 : 99,393.78 = 66,112.12 : x
  2. Step 2: Convert to fraction form
    72,060.76/99,393.78 = 66,112.12/x
  3. Step 3: Cross multiply
    72,060.76x = 99,393.78 × 66,112.12
  4. Step 4: Simplify right side
    72,060.76x = 6,571,133,510.61
  5. Step 5: Solve for x
    x = 6,571,133,510.61/72,060.76
  6. Step 6: Final answer
    x = 91,188.79

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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.