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Finding the Fourth Proportional to 128,348.68, 177,127.86 and 77,377.64

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Solution

The fourth proportional to 128,348.68, 177,127.86 and 77,377.64 is: 106,785.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,348.68 : 177,127.86 = 77,377.64 : x
  2. Step 2: Convert to fraction form
    128,348.68/177,127.86 = 77,377.64/x
  3. Step 3: Cross multiply
    128,348.68x = 177,127.86 × 77,377.64
  4. Step 4: Simplify right side
    128,348.68x = 13,705,735,785.05
  5. Step 5: Solve for x
    x = 13,705,735,785.05/128,348.68
  6. Step 6: Final answer
    x = 106,785.17

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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.