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Finding the Fourth Proportional to 428,602.34, 642,840.32 and 113,081.42

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Solution

The fourth proportional to 428,602.34, 642,840.32 and 113,081.42 is: 169,605.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,602.34 : 642,840.32 = 113,081.42 : x
  2. Step 2: Convert to fraction form
    428,602.34/642,840.32 = 113,081.42/x
  3. Step 3: Cross multiply
    428,602.34x = 642,840.32 × 113,081.42
  4. Step 4: Simplify right side
    428,602.34x = 72,693,292,439.25
  5. Step 5: Solve for x
    x = 72,693,292,439.25/428,602.34
  6. Step 6: Final answer
    x = 169,605.45

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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.