Home / 139,378.16-192,357.21-78,130.20

Finding the Fourth Proportional to 139,378.16, 192,357.21 and 78,130.20

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Solution

The fourth proportional to 139,378.16, 192,357.21 and 78,130.20 is: 107,828.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,378.16 : 192,357.21 = 78,130.20 : x
  2. Step 2: Convert to fraction form
    139,378.16/192,357.21 = 78,130.20/x
  3. Step 3: Cross multiply
    139,378.16x = 192,357.21 × 78,130.20
  4. Step 4: Simplify right side
    139,378.16x = 15,028,907,288.74
  5. Step 5: Solve for x
    x = 15,028,907,288.74/139,378.16
  6. Step 6: Final answer
    x = 107,828.28

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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.