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Finding the Fourth Proportional to 210,508.65, 315,987.78 and 90,624.96

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Solution

The fourth proportional to 210,508.65, 315,987.78 and 90,624.96 is: 136,034.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,508.65 : 315,987.78 = 90,624.96 : x
  2. Step 2: Convert to fraction form
    210,508.65/315,987.78 = 90,624.96/x
  3. Step 3: Cross multiply
    210,508.65x = 315,987.78 × 90,624.96
  4. Step 4: Simplify right side
    210,508.65x = 28,636,379,922.99
  5. Step 5: Solve for x
    x = 28,636,379,922.99/210,508.65
  6. Step 6: Final answer
    x = 136,034.22

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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.