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Finding the Fourth Proportional to 210,370.70, 315,458.85 and 91,981.10

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Solution

The fourth proportional to 210,370.70, 315,458.85 and 91,981.10 is: 137,929.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,370.70 : 315,458.85 = 91,981.10 : x
  2. Step 2: Convert to fraction form
    210,370.70/315,458.85 = 91,981.10/x
  3. Step 3: Cross multiply
    210,370.70x = 315,458.85 × 91,981.10
  4. Step 4: Simplify right side
    210,370.70x = 29,016,252,027.74
  5. Step 5: Solve for x
    x = 29,016,252,027.74/210,370.70
  6. Step 6: Final answer
    x = 137,929.15

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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.