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Finding the Fourth Proportional to 68,614.40, 102,921.60 and 47,619.20

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Solution

The fourth proportional to 68,614.40, 102,921.60 and 47,619.20 is: 71,428.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,614.40 : 102,921.60 = 47,619.20 : x
  2. Step 2: Convert to fraction form
    68,614.40/102,921.60 = 47,619.20/x
  3. Step 3: Cross multiply
    68,614.40x = 102,921.60 × 47,619.20
  4. Step 4: Simplify right side
    68,614.40x = 4,901,044,254.72
  5. Step 5: Solve for x
    x = 4,901,044,254.72/68,614.40
  6. Step 6: Final answer
    x = 71,428.80

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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.