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Finding the Fourth Proportional to 128,924.40, 177,879.16 and 83,604.20

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Solution

The fourth proportional to 128,924.40, 177,879.16 and 83,604.20 is: 115,350.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,924.40 : 177,879.16 = 83,604.20 : x
  2. Step 2: Convert to fraction form
    128,924.40/177,879.16 = 83,604.20/x
  3. Step 3: Cross multiply
    128,924.40x = 177,879.16 × 83,604.20
  4. Step 4: Simplify right side
    128,924.40x = 14,871,444,868.47
  5. Step 5: Solve for x
    x = 14,871,444,868.47/128,924.40
  6. Step 6: Final answer
    x = 115,350.12

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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.