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Finding the Fourth Proportional to 138,828.34, 208,279.37 and 72,248.77

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Solution

The fourth proportional to 138,828.34, 208,279.37 and 72,248.77 is: 108,392.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,828.34 : 208,279.37 = 72,248.77 : x
  2. Step 2: Convert to fraction form
    138,828.34/208,279.37 = 72,248.77/x
  3. Step 3: Cross multiply
    138,828.34x = 208,279.37 × 72,248.77
  4. Step 4: Simplify right side
    138,828.34x = 15,047,928,298.87
  5. Step 5: Solve for x
    x = 15,047,928,298.87/138,828.34
  6. Step 6: Final answer
    x = 108,392.34

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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.