Home / 128,411.04-177,178.68-80,646.96

Finding the Fourth Proportional to 128,411.04, 177,178.68 and 80,646.96

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Solution

The fourth proportional to 128,411.04, 177,178.68 and 80,646.96 is: 111,274.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,411.04 : 177,178.68 = 80,646.96 : x
  2. Step 2: Convert to fraction form
    128,411.04/177,178.68 = 80,646.96/x
  3. Step 3: Cross multiply
    128,411.04x = 177,178.68 × 80,646.96
  4. Step 4: Simplify right side
    128,411.04x = 14,288,921,918.81
  5. Step 5: Solve for x
    x = 14,288,921,918.81/128,411.04
  6. Step 6: Final answer
    x = 111,274.87

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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.