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Finding the Fourth Proportional to 139,130.98, 192,004.20 and 78,698.68

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Solution

The fourth proportional to 139,130.98, 192,004.20 and 78,698.68 is: 108,606.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,130.98 : 192,004.20 = 78,698.68 : x
  2. Step 2: Convert to fraction form
    139,130.98/192,004.20 = 78,698.68/x
  3. Step 3: Cross multiply
    139,130.98x = 192,004.20 × 78,698.68
  4. Step 4: Simplify right side
    139,130.98x = 15,110,477,094.46
  5. Step 5: Solve for x
    x = 15,110,477,094.46/139,130.98
  6. Step 6: Final answer
    x = 108,606.13

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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.