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Finding the Fourth Proportional to 84,745.20, 127,117.80 and 70,921.20

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Solution

The fourth proportional to 84,745.20, 127,117.80 and 70,921.20 is: 106,381.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,745.20 : 127,117.80 = 70,921.20 : x
  2. Step 2: Convert to fraction form
    84,745.20/127,117.80 = 70,921.20/x
  3. Step 3: Cross multiply
    84,745.20x = 127,117.80 × 70,921.20
  4. Step 4: Simplify right side
    84,745.20x = 9,015,346,917.36
  5. Step 5: Solve for x
    x = 9,015,346,917.36/84,745.20
  6. Step 6: Final answer
    x = 106,381.80

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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.