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Finding the Fourth Proportional to 85,613,312.80, 128,207,392.80 and 68,607,200.80

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Solution

The fourth proportional to 85,613,312.80, 128,207,392.80 and 68,607,200.80 is: 102,740,450.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,613,312.80 : 128,207,392.80 = 68,607,200.80 : x
  2. Step 2: Convert to fraction form
    85,613,312.80/128,207,392.80 = 68,607,200.80/x
  3. Step 3: Cross multiply
    85,613,312.80x = 128,207,392.80 × 68,607,200.80
  4. Step 4: Simplify right side
    85,613,312.80x = 8,795,950,341,874,074
  5. Step 5: Solve for x
    x = 8,795,950,341,874,074/85,613,312.80
  6. Step 6: Final answer
    x = 102,740,450.69

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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.