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Finding the Fourth Proportional to 320,475.60, 480,079.80 and 281,077.20

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Solution

The fourth proportional to 320,475.60, 480,079.80 and 281,077.20 is: 421,060.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,475.60 : 480,079.80 = 281,077.20 : x
  2. Step 2: Convert to fraction form
    320,475.60/480,079.80 = 281,077.20/x
  3. Step 3: Cross multiply
    320,475.60x = 480,079.80 × 281,077.20
  4. Step 4: Simplify right side
    320,475.60x = 134,939,485,960.56
  5. Step 5: Solve for x
    x = 134,939,485,960.56/320,475.60
  6. Step 6: Final answer
    x = 421,060.09

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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.