Home / 128,715.89-177,628.14-72,127.26

Finding the Fourth Proportional to 128,715.89, 177,628.14 and 72,127.26

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Solution

The fourth proportional to 128,715.89, 177,628.14 and 72,127.26 is: 99,535.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,715.89 : 177,628.14 = 72,127.26 : x
  2. Step 2: Convert to fraction form
    128,715.89/177,628.14 = 72,127.26/x
  3. Step 3: Cross multiply
    128,715.89x = 177,628.14 × 72,127.26
  4. Step 4: Simplify right side
    128,715.89x = 12,811,831,037.10
  5. Step 5: Solve for x
    x = 12,811,831,037.10/128,715.89
  6. Step 6: Final answer
    x = 99,535.74

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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.