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Finding the Fourth Proportional to 328,086.15, 492,129.20 and 78,768.15

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Solution

The fourth proportional to 328,086.15, 492,129.20 and 78,768.15 is: 118,152.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,086.15 : 492,129.20 = 78,768.15 : x
  2. Step 2: Convert to fraction form
    328,086.15/492,129.20 = 78,768.15/x
  3. Step 3: Cross multiply
    328,086.15x = 492,129.20 × 78,768.15
  4. Step 4: Simplify right side
    328,086.15x = 38,764,106,251.14
  5. Step 5: Solve for x
    x = 38,764,106,251.14/328,086.15
  6. Step 6: Final answer
    x = 118,152.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.