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Finding the Fourth Proportional to 139,225.90, 192,115.80 and 77,963.55

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Solution

The fourth proportional to 139,225.90, 192,115.80 and 77,963.55 is: 107,580.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,225.90 : 192,115.80 = 77,963.55 : x
  2. Step 2: Convert to fraction form
    139,225.90/192,115.80 = 77,963.55/x
  3. Step 3: Cross multiply
    139,225.90x = 192,115.80 × 77,963.55
  4. Step 4: Simplify right side
    139,225.90x = 14,978,029,869.14
  5. Step 5: Solve for x
    x = 14,978,029,869.14/139,225.90
  6. Step 6: Final answer
    x = 107,580.77

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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.