Home / 128,557,030.80-177,420,270.78-72,816,008.61

Finding the Fourth Proportional to 128,557,030.80, 177,420,270.78 and 72,816,008.61

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Solution

The fourth proportional to 128,557,030.80, 177,420,270.78 and 72,816,008.61 is: 100,492,644.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,557,030.80 : 177,420,270.78 = 72,816,008.61 : x
  2. Step 2: Convert to fraction form
    128,557,030.80/177,420,270.78 = 72,816,008.61/x
  3. Step 3: Cross multiply
    128,557,030.80x = 177,420,270.78 × 72,816,008.61
  4. Step 4: Simplify right side
    128,557,030.80x = 12,919,035,964,705,012
  5. Step 5: Solve for x
    x = 12,919,035,964,705,012/128,557,030.80
  6. Step 6: Final answer
    x = 100,492,644.27

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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.