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Finding the Fourth Proportional to 139,512.60, 208,977.30 and 77,110.20

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Solution

The fourth proportional to 139,512.60, 208,977.30 and 77,110.20 is: 115,504.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,512.60 : 208,977.30 = 77,110.20 : x
  2. Step 2: Convert to fraction form
    139,512.60/208,977.30 = 77,110.20/x
  3. Step 3: Cross multiply
    139,512.60x = 208,977.30 × 77,110.20
  4. Step 4: Simplify right side
    139,512.60x = 16,114,281,398.46
  5. Step 5: Solve for x
    x = 16,114,281,398.46/139,512.60
  6. Step 6: Final answer
    x = 115,504.13

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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.