Home / 81,007.10-121,457.85-72,712.70

Finding the Fourth Proportional to 81,007.10, 121,457.85 and 72,712.70

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Solution

The fourth proportional to 81,007.10, 121,457.85 and 72,712.70 is: 109,021.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,007.10 : 121,457.85 = 72,712.70 : x
  2. Step 2: Convert to fraction form
    81,007.10/121,457.85 = 72,712.70/x
  3. Step 3: Cross multiply
    81,007.10x = 121,457.85 × 72,712.70
  4. Step 4: Simplify right side
    81,007.10x = 8,831,528,209.70
  5. Step 5: Solve for x
    x = 8,831,528,209.70/81,007.10
  6. Step 6: Final answer
    x = 109,021.66

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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.