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Finding the Fourth Proportional to 68,668.16, 103,018.29 and 21,280.76

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Solution

The fourth proportional to 68,668.16, 103,018.29 and 21,280.76 is: 31,926.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,668.16 : 103,018.29 = 21,280.76 : x
  2. Step 2: Convert to fraction form
    68,668.16/103,018.29 = 21,280.76/x
  3. Step 3: Cross multiply
    68,668.16x = 103,018.29 × 21,280.76
  4. Step 4: Simplify right side
    68,668.16x = 2,192,307,880.76
  5. Step 5: Solve for x
    x = 2,192,307,880.76/68,668.16
  6. Step 6: Final answer
    x = 31,926.12

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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.