Home / 428,889.16-643,329.78-109,041.76

Finding the Fourth Proportional to 428,889.16, 643,329.78 and 109,041.76

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Solution

The fourth proportional to 428,889.16, 643,329.78 and 109,041.76 is: 163,561.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,889.16 : 643,329.78 = 109,041.76 : x
  2. Step 2: Convert to fraction form
    428,889.16/643,329.78 = 109,041.76/x
  3. Step 3: Cross multiply
    428,889.16x = 643,329.78 × 109,041.76
  4. Step 4: Simplify right side
    428,889.16x = 70,149,811,471.61
  5. Step 5: Solve for x
    x = 70,149,811,471.61/428,889.16
  6. Step 6: Final answer
    x = 163,561.63

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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.