Home / 428,974.07-643,464.78-109,126.23

Finding the Fourth Proportional to 428,974.07, 643,464.78 and 109,126.23

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Solution

The fourth proportional to 428,974.07, 643,464.78 and 109,126.23 is: 163,690.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,974.07 : 643,464.78 = 109,126.23 : x
  2. Step 2: Convert to fraction form
    428,974.07/643,464.78 = 109,126.23/x
  3. Step 3: Cross multiply
    428,974.07x = 643,464.78 × 109,126.23
  4. Step 4: Simplify right side
    428,974.07x = 70,218,886,154.20
  5. Step 5: Solve for x
    x = 70,218,886,154.20/428,974.07
  6. Step 6: Final answer
    x = 163,690.28

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1.5x scale

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.