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Finding the Fourth Proportional to 643,661.14, 887,634.51 and 385,496.74

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Solution

The fourth proportional to 643,661.14, 887,634.51 and 385,496.74 is: 531,615.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,661.14 : 887,634.51 = 385,496.74 : x
  2. Step 2: Convert to fraction form
    643,661.14/887,634.51 = 385,496.74/x
  3. Step 3: Cross multiply
    643,661.14x = 887,634.51 × 385,496.74
  4. Step 4: Simplify right side
    643,661.14x = 342,180,209,916.50
  5. Step 5: Solve for x
    x = 342,180,209,916.50/643,661.14
  6. Step 6: Final answer
    x = 531,615.46

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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.