Home / 128,826.36-177,780.40-72,237.76

Finding the Fourth Proportional to 128,826.36, 177,780.40 and 72,237.76

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Solution

The fourth proportional to 128,826.36, 177,780.40 and 72,237.76 is: 99,688.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,826.36 : 177,780.40 = 72,237.76 : x
  2. Step 2: Convert to fraction form
    128,826.36/177,780.40 = 72,237.76/x
  3. Step 3: Cross multiply
    128,826.36x = 177,780.40 × 72,237.76
  4. Step 4: Simplify right side
    128,826.36x = 12,842,457,867.90
  5. Step 5: Solve for x
    x = 12,842,457,867.90/128,826.36
  6. Step 6: Final answer
    x = 99,688.12

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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.