Home / 81,020.16-121,355.28-79,037.28

Finding the Fourth Proportional to 81,020.16, 121,355.28 and 79,037.28

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Solution

The fourth proportional to 81,020.16, 121,355.28 and 79,037.28 is: 118,385.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,020.16 : 121,355.28 = 79,037.28 : x
  2. Step 2: Convert to fraction form
    81,020.16/121,355.28 = 79,037.28/x
  3. Step 3: Cross multiply
    81,020.16x = 121,355.28 × 79,037.28
  4. Step 4: Simplify right side
    81,020.16x = 9,591,591,244.84
  5. Step 5: Solve for x
    x = 9,591,591,244.84/81,020.16
  6. Step 6: Final answer
    x = 118,385.24

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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.