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Finding the Fourth Proportional to 90,869, 125,406.90 and 51,132.68

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Solution

The fourth proportional to 90,869, 125,406.90 and 51,132.68 is: 70,567.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,869 : 125,406.90 = 51,132.68 : x
  2. Step 2: Convert to fraction form
    90,869/125,406.90 = 51,132.68/x
  3. Step 3: Cross multiply
    90,869x = 125,406.90 × 51,132.68
  4. Step 4: Simplify right side
    90,869x = 6,412,390,887.49
  5. Step 5: Solve for x
    x = 6,412,390,887.49/90,869
  6. Step 6: Final answer
    x = 70,567.42

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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.