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Finding the Fourth Proportional to 139,415, 192,393.60 and 75,752.78

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Solution

The fourth proportional to 139,415, 192,393.60 and 75,752.78 is: 104,539.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,415 : 192,393.60 = 75,752.78 : x
  2. Step 2: Convert to fraction form
    139,415/192,393.60 = 75,752.78/x
  3. Step 3: Cross multiply
    139,415x = 192,393.60 × 75,752.78
  4. Step 4: Simplify right side
    139,415x = 14,574,350,054.21
  5. Step 5: Solve for x
    x = 14,574,350,054.21/139,415
  6. Step 6: Final answer
    x = 104,539.33

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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.