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Finding the Fourth Proportional to 139,412.96, 192,291.36 and 85,728.32

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Solution

The fourth proportional to 139,412.96, 192,291.36 and 85,728.32 is: 118,244.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,412.96 : 192,291.36 = 85,728.32 : x
  2. Step 2: Convert to fraction form
    139,412.96/192,291.36 = 85,728.32/x
  3. Step 3: Cross multiply
    139,412.96x = 192,291.36 × 85,728.32
  4. Step 4: Simplify right side
    139,412.96x = 16,484,815,243.32
  5. Step 5: Solve for x
    x = 16,484,815,243.32/139,412.96
  6. Step 6: Final answer
    x = 118,244.50

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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.