Home / 428,989.01-643,487.26-109,141.16

Finding the Fourth Proportional to 428,989.01, 643,487.26 and 109,141.16

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Solution

The fourth proportional to 428,989.01, 643,487.26 and 109,141.16 is: 163,712.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,989.01 : 643,487.26 = 109,141.16 : x
  2. Step 2: Convert to fraction form
    428,989.01/643,487.26 = 109,141.16/x
  3. Step 3: Cross multiply
    428,989.01x = 643,487.26 × 109,141.16
  4. Step 4: Simplify right side
    428,989.01x = 70,230,947,337.49
  5. Step 5: Solve for x
    x = 70,230,947,337.49/428,989.01
  6. Step 6: Final answer
    x = 163,712.70

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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.