Home / 85,815,272.80-128,722,909.20-68,809,160.80

Finding the Fourth Proportional to 85,815,272.80, 128,722,909.20 and 68,809,160.80

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Solution

The fourth proportional to 85,815,272.80, 128,722,909.20 and 68,809,160.80 is: 103,213,741.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,815,272.80 : 128,722,909.20 = 68,809,160.80 : x
  2. Step 2: Convert to fraction form
    85,815,272.80/128,722,909.20 = 68,809,160.80/x
  3. Step 3: Cross multiply
    85,815,272.80x = 128,722,909.20 × 68,809,160.80
  4. Step 4: Simplify right side
    85,815,272.80x = 8,857,315,357,786,599
  5. Step 5: Solve for x
    x = 8,857,315,357,786,599/85,815,272.80
  6. Step 6: Final answer
    x = 103,213,741.20

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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.