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Finding the Fourth Proportional to 101,280.20, 139,766.70 and 56,568.20

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Solution

The fourth proportional to 101,280.20, 139,766.70 and 56,568.20 is: 78,064.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,280.20 : 139,766.70 = 56,568.20 : x
  2. Step 2: Convert to fraction form
    101,280.20/139,766.70 = 56,568.20/x
  3. Step 3: Cross multiply
    101,280.20x = 139,766.70 × 56,568.20
  4. Step 4: Simplify right side
    101,280.20x = 7,906,349,940.11
  5. Step 5: Solve for x
    x = 7,906,349,940.11/101,280.20
  6. Step 6: Final answer
    x = 78,064.13

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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.