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Finding the Fourth Proportional to 643,060.55, 887,435.76 and 352,653.71

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Solution

The fourth proportional to 643,060.55, 887,435.76 and 352,653.71 is: 486,668.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,060.55 : 887,435.76 = 352,653.71 : x
  2. Step 2: Convert to fraction form
    643,060.55/887,435.76 = 352,653.71/x
  3. Step 3: Cross multiply
    643,060.55x = 887,435.76 × 352,653.71
  4. Step 4: Simplify right side
    643,060.55x = 312,957,508,713.49
  5. Step 5: Solve for x
    x = 312,957,508,713.49/643,060.55
  6. Step 6: Final answer
    x = 486,668.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.