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Finding the Fourth Proportional to 211,357.15, 291,665.15 and 115,861.79

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Solution

The fourth proportional to 211,357.15, 291,665.15 and 115,861.79 is: 159,885.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,357.15 : 291,665.15 = 115,861.79 : x
  2. Step 2: Convert to fraction form
    211,357.15/291,665.15 = 115,861.79/x
  3. Step 3: Cross multiply
    211,357.15x = 291,665.15 × 115,861.79
  4. Step 4: Simplify right side
    211,357.15x = 33,792,847,595.68
  5. Step 5: Solve for x
    x = 33,792,847,595.68/211,357.15
  6. Step 6: Final answer
    x = 159,885.05

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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.