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Finding the Fourth Proportional to 639,023.40, 957,368.70 and 389,413.80

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Solution

The fourth proportional to 639,023.40, 957,368.70 and 389,413.80 is: 583,409.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,023.40 : 957,368.70 = 389,413.80 : x
  2. Step 2: Convert to fraction form
    639,023.40/957,368.70 = 389,413.80/x
  3. Step 3: Cross multiply
    639,023.40x = 957,368.70 × 389,413.80
  4. Step 4: Simplify right side
    639,023.40x = 372,812,583,468.06
  5. Step 5: Solve for x
    x = 372,812,583,468.06/639,023.40
  6. Step 6: Final answer
    x = 583,409.91

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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.