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Finding the Fourth Proportional to 128,775.68, 177,709.88 and 72,187.06

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Solution

The fourth proportional to 128,775.68, 177,709.88 and 72,187.06 is: 99,617.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,775.68 : 177,709.88 = 72,187.06 : x
  2. Step 2: Convert to fraction form
    128,775.68/177,709.88 = 72,187.06/x
  3. Step 3: Cross multiply
    128,775.68x = 177,709.88 × 72,187.06
  4. Step 4: Simplify right side
    128,775.68x = 12,828,353,770.15
  5. Step 5: Solve for x
    x = 12,828,353,770.15/128,775.68
  6. Step 6: Final answer
    x = 99,617.83

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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.