Home / 428,715.09-643,206.48-258,123.81

Finding the Fourth Proportional to 428,715.09, 643,206.48 and 258,123.81

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Solution

The fourth proportional to 428,715.09, 643,206.48 and 258,123.81 is: 387,266.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,715.09 : 643,206.48 = 258,123.81 : x
  2. Step 2: Convert to fraction form
    428,715.09/643,206.48 = 258,123.81/x
  3. Step 3: Cross multiply
    428,715.09x = 643,206.48 × 258,123.81
  4. Step 4: Simplify right side
    428,715.09x = 166,026,907,234.29
  5. Step 5: Solve for x
    x = 166,026,907,234.29/428,715.09
  6. Step 6: Final answer
    x = 387,266.30

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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.