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Finding the Fourth Proportional to 68,897.72, 103,348.54 and 18,978.52

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Solution

The fourth proportional to 68,897.72, 103,348.54 and 18,978.52 is: 28,468.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,897.72 : 103,348.54 = 18,978.52 : x
  2. Step 2: Convert to fraction form
    68,897.72/103,348.54 = 18,978.52/x
  3. Step 3: Cross multiply
    68,897.72x = 103,348.54 × 18,978.52
  4. Step 4: Simplify right side
    68,897.72x = 1,961,402,333.36
  5. Step 5: Solve for x
    x = 1,961,402,333.36/68,897.72
  6. Step 6: Final answer
    x = 28,468.32

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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.