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Finding the Fourth Proportional to 139,702.74, 192,784.05 and 79,272.15

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Solution

The fourth proportional to 139,702.74, 192,784.05 and 79,272.15 is: 109,392.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,702.74 : 192,784.05 = 79,272.15 : x
  2. Step 2: Convert to fraction form
    139,702.74/192,784.05 = 79,272.15/x
  3. Step 3: Cross multiply
    139,702.74x = 192,784.05 × 79,272.15
  4. Step 4: Simplify right side
    139,702.74x = 15,282,406,129.21
  5. Step 5: Solve for x
    x = 15,282,406,129.21/139,702.74
  6. Step 6: Final answer
    x = 109,392.31

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1.5x scale

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.