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Finding the Fourth Proportional to 643,915.81, 888,559.37 and 357,413.34

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Solution

The fourth proportional to 643,915.81, 888,559.37 and 357,413.34 is: 493,205.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,915.81 : 888,559.37 = 357,413.34 : x
  2. Step 2: Convert to fraction form
    643,915.81/888,559.37 = 357,413.34/x
  3. Step 3: Cross multiply
    643,915.81x = 888,559.37 × 357,413.34
  4. Step 4: Simplify right side
    643,915.81x = 317,582,975,105.33
  5. Step 5: Solve for x
    x = 317,582,975,105.33/643,915.81
  6. Step 6: Final answer
    x = 493,205.74

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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.