Home / 128,780.06-177,715.77-72,190.22

Finding the Fourth Proportional to 128,780.06, 177,715.77 and 72,190.22

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Solution

The fourth proportional to 128,780.06, 177,715.77 and 72,190.22 is: 99,622.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,780.06 : 177,715.77 = 72,190.22 : x
  2. Step 2: Convert to fraction form
    128,780.06/177,715.77 = 72,190.22/x
  3. Step 3: Cross multiply
    128,780.06x = 177,715.77 × 72,190.22
  4. Step 4: Simplify right side
    128,780.06x = 12,829,340,533.77
  5. Step 5: Solve for x
    x = 12,829,340,533.77/128,780.06
  6. Step 6: Final answer
    x = 99,622.10

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1.5x scale

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.