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Finding the Fourth Proportional to 139,038.40, 208,600.80 and 54,809.20

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Solution

The fourth proportional to 139,038.40, 208,600.80 and 54,809.20 is: 82,230.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,038.40 : 208,600.80 = 54,809.20 : x
  2. Step 2: Convert to fraction form
    139,038.40/208,600.80 = 54,809.20/x
  3. Step 3: Cross multiply
    139,038.40x = 208,600.80 × 54,809.20
  4. Step 4: Simplify right side
    139,038.40x = 11,433,242,967.36
  5. Step 5: Solve for x
    x = 11,433,242,967.36/139,038.40
  6. Step 6: Final answer
    x = 82,230.83

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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.