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Finding the Fourth Proportional to 68,668.96, 102,963.72 and 21,271.40

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Solution

The fourth proportional to 68,668.96, 102,963.72 and 21,271.40 is: 31,894.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,668.96 : 102,963.72 = 21,271.40 : x
  2. Step 2: Convert to fraction form
    68,668.96/102,963.72 = 21,271.40/x
  3. Step 3: Cross multiply
    68,668.96x = 102,963.72 × 21,271.40
  4. Step 4: Simplify right side
    68,668.96x = 2,190,182,473.61
  5. Step 5: Solve for x
    x = 2,190,182,473.61/68,668.96
  6. Step 6: Final answer
    x = 31,894.80

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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.