Home / 128,304,006.40-192,456,009.60-78,986,281.60

Finding the Fourth Proportional to 128,304,006.40, 192,456,009.60 and 78,986,281.60

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Solution

The fourth proportional to 128,304,006.40, 192,456,009.60 and 78,986,281.60 is: 118,479,422.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,304,006.40 : 192,456,009.60 = 78,986,281.60 : x
  2. Step 2: Convert to fraction form
    128,304,006.40/192,456,009.60 = 78,986,281.60/x
  3. Step 3: Cross multiply
    128,304,006.40x = 192,456,009.60 × 78,986,281.60
  4. Step 4: Simplify right side
    128,304,006.40x = 15,201,384,569,877,902
  5. Step 5: Solve for x
    x = 15,201,384,569,877,902/128,304,006.40
  6. Step 6: Final answer
    x = 118,479,422.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.