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Finding the Fourth Proportional to 428,322.78, 642,485.63 and 108,474.53

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Solution

The fourth proportional to 428,322.78, 642,485.63 and 108,474.53 is: 162,712.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,322.78 : 642,485.63 = 108,474.53 : x
  2. Step 2: Convert to fraction form
    428,322.78/642,485.63 = 108,474.53/x
  3. Step 3: Cross multiply
    428,322.78x = 642,485.63 × 108,474.53
  4. Step 4: Simplify right side
    428,322.78x = 69,693,328,623.40
  5. Step 5: Solve for x
    x = 69,693,328,623.40/428,322.78
  6. Step 6: Final answer
    x = 162,712.17

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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.