Home / 428,685.35-643,028.29-108,861.17

Finding the Fourth Proportional to 428,685.35, 643,028.29 and 108,861.17

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Solution

The fourth proportional to 428,685.35, 643,028.29 and 108,861.17 is: 163,291.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,685.35 : 643,028.29 = 108,861.17 : x
  2. Step 2: Convert to fraction form
    428,685.35/643,028.29 = 108,861.17/x
  3. Step 3: Cross multiply
    428,685.35x = 643,028.29 × 108,861.17
  4. Step 4: Simplify right side
    428,685.35x = 70,000,808,505.20
  5. Step 5: Solve for x
    x = 70,000,808,505.20/428,685.35
  6. Step 6: Final answer
    x = 163,291.82

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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.