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Finding the Fourth Proportional to 68,697.34, 103,052.31 and 21,312.79

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Solution

The fourth proportional to 68,697.34, 103,052.31 and 21,312.79 is: 31,971.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,697.34 : 103,052.31 = 21,312.79 : x
  2. Step 2: Convert to fraction form
    68,697.34/103,052.31 = 21,312.79/x
  3. Step 3: Cross multiply
    68,697.34x = 103,052.31 × 21,312.79
  4. Step 4: Simplify right side
    68,697.34x = 2,196,332,242.04
  5. Step 5: Solve for x
    x = 2,196,332,242.04/68,697.34
  6. Step 6: Final answer
    x = 31,971.14

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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.