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Finding the Fourth Proportional to 72,671.95, 100,286.67 and 40,840.78

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Solution

The fourth proportional to 72,671.95, 100,286.67 and 40,840.78 is: 56,359.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,671.95 : 100,286.67 = 40,840.78 : x
  2. Step 2: Convert to fraction form
    72,671.95/100,286.67 = 40,840.78/x
  3. Step 3: Cross multiply
    72,671.95x = 100,286.67 × 40,840.78
  4. Step 4: Simplify right side
    72,671.95x = 4,095,785,826.40
  5. Step 5: Solve for x
    x = 4,095,785,826.40/72,671.95
  6. Step 6: Final answer
    x = 56,359.93

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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.