Home / 428,613.61-643,054.29-258,022.12

Finding the Fourth Proportional to 428,613.61, 643,054.29 and 258,022.12

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Solution

The fourth proportional to 428,613.61, 643,054.29 and 258,022.12 is: 387,113.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,613.61 : 643,054.29 = 258,022.12 : x
  2. Step 2: Convert to fraction form
    428,613.61/643,054.29 = 258,022.12/x
  3. Step 3: Cross multiply
    428,613.61x = 643,054.29 × 258,022.12
  4. Step 4: Simplify right side
    428,613.61x = 165,922,231,180.90
  5. Step 5: Solve for x
    x = 165,922,231,180.90/428,613.61
  6. Step 6: Final answer
    x = 387,113.77

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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.