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Finding the Fourth Proportional to 68,702.66, 103,049.06 and 21,316.53

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Solution

The fourth proportional to 68,702.66, 103,049.06 and 21,316.53 is: 31,973.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,702.66 : 103,049.06 = 21,316.53 : x
  2. Step 2: Convert to fraction form
    68,702.66/103,049.06 = 21,316.53/x
  3. Step 3: Cross multiply
    68,702.66x = 103,049.06 × 21,316.53
  4. Step 4: Simplify right side
    68,702.66x = 2,196,648,272.38
  5. Step 5: Solve for x
    x = 2,196,648,272.38/68,702.66
  6. Step 6: Final answer
    x = 31,973.27

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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.