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Finding the Fourth Proportional to 388,685.80, 583,287.90 and 178,215.40

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Solution

The fourth proportional to 388,685.80, 583,287.90 and 178,215.40 is: 267,441.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,685.80 : 583,287.90 = 178,215.40 : x
  2. Step 2: Convert to fraction form
    388,685.80/583,287.90 = 178,215.40/x
  3. Step 3: Cross multiply
    388,685.80x = 583,287.90 × 178,215.40
  4. Step 4: Simplify right side
    388,685.80x = 103,950,886,413.66
  5. Step 5: Solve for x
    x = 103,950,886,413.66/388,685.80
  6. Step 6: Final answer
    x = 267,441.95

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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.