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Finding the Fourth Proportional to 210,917.20, 316,326.12 and 61,117.96

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Solution

The fourth proportional to 210,917.20, 316,326.12 and 61,117.96 is: 91,662.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,917.20 : 316,326.12 = 61,117.96 : x
  2. Step 2: Convert to fraction form
    210,917.20/316,326.12 = 61,117.96/x
  3. Step 3: Cross multiply
    210,917.20x = 316,326.12 × 61,117.96
  4. Step 4: Simplify right side
    210,917.20x = 19,333,207,149.12
  5. Step 5: Solve for x
    x = 19,333,207,149.12/210,917.20
  6. Step 6: Final answer
    x = 91,662.54

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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.