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Finding the Fourth Proportional to 139,909.21, 193,068.16 and 79,478.35

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Solution

The fourth proportional to 139,909.21, 193,068.16 and 79,478.35 is: 109,676.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,909.21 : 193,068.16 = 79,478.35 : x
  2. Step 2: Convert to fraction form
    139,909.21/193,068.16 = 79,478.35/x
  3. Step 3: Cross multiply
    139,909.21x = 193,068.16 × 79,478.35
  4. Step 4: Simplify right side
    139,909.21x = 15,344,738,794.34
  5. Step 5: Solve for x
    x = 15,344,738,794.34/139,909.21
  6. Step 6: Final answer
    x = 109,676.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.