Home / 85,407,013.20-128,110,519.80-81,438,920.40

Finding the Fourth Proportional to 85,407,013.20, 128,110,519.80 and 81,438,920.40

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Solution

The fourth proportional to 85,407,013.20, 128,110,519.80 and 81,438,920.40 is: 122,158,380.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,407,013.20 : 128,110,519.80 = 81,438,920.40 : x
  2. Step 2: Convert to fraction form
    85,407,013.20/128,110,519.80 = 81,438,920.40/x
  3. Step 3: Cross multiply
    85,407,013.20x = 128,110,519.80 × 81,438,920.40
  4. Step 4: Simplify right side
    85,407,013.20x = 10,433,182,424,394,824
  5. Step 5: Solve for x
    x = 10,433,182,424,394,824/85,407,013.20
  6. Step 6: Final answer
    x = 122,158,380.60

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1.5x scale

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.