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Finding the Fourth Proportional to 139,276.84, 208,835.13 and 74,281.06

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Solution

The fourth proportional to 139,276.84, 208,835.13 and 74,281.06 is: 111,378.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,276.84 : 208,835.13 = 74,281.06 : x
  2. Step 2: Convert to fraction form
    139,276.84/208,835.13 = 74,281.06/x
  3. Step 3: Cross multiply
    139,276.84x = 208,835.13 × 74,281.06
  4. Step 4: Simplify right side
    139,276.84x = 15,512,493,777.46
  5. Step 5: Solve for x
    x = 15,512,493,777.46/139,276.84
  6. Step 6: Final answer
    x = 111,378.85

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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.