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Finding the Fourth Proportional to 210,809.52, 316,138.67 and 61,018.81

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Solution

The fourth proportional to 210,809.52, 316,138.67 and 61,018.81 is: 91,506.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,809.52 : 316,138.67 = 61,018.81 : x
  2. Step 2: Convert to fraction form
    210,809.52/316,138.67 = 61,018.81/x
  3. Step 3: Cross multiply
    210,809.52x = 316,138.67 × 61,018.81
  4. Step 4: Simplify right side
    210,809.52x = 19,290,405,438.38
  5. Step 5: Solve for x
    x = 19,290,405,438.38/210,809.52
  6. Step 6: Final answer
    x = 91,506.33

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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.