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Finding the Fourth Proportional to 428,393.28, 642,621.12 and 112,848

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Solution

The fourth proportional to 428,393.28, 642,621.12 and 112,848 is: 169,280.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,393.28 : 642,621.12 = 112,848 : x
  2. Step 2: Convert to fraction form
    428,393.28/642,621.12 = 112,848/x
  3. Step 3: Cross multiply
    428,393.28x = 642,621.12 × 112,848
  4. Step 4: Simplify right side
    428,393.28x = 72,518,508,149.76
  5. Step 5: Solve for x
    x = 72,518,508,149.76/428,393.28
  6. Step 6: Final answer
    x = 169,280.22

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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.