Home / 81,021.16-121,356.78-79,038.28

Finding the Fourth Proportional to 81,021.16, 121,356.78 and 79,038.28

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Solution

The fourth proportional to 81,021.16, 121,356.78 and 79,038.28 is: 118,386.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,021.16 : 121,356.78 = 79,038.28 : x
  2. Step 2: Convert to fraction form
    81,021.16/121,356.78 = 79,038.28/x
  3. Step 3: Cross multiply
    81,021.16x = 121,356.78 × 79,038.28
  4. Step 4: Simplify right side
    81,021.16x = 9,591,831,157.54
  5. Step 5: Solve for x
    x = 9,591,831,157.54/81,021.16
  6. Step 6: Final answer
    x = 118,386.74

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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.