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Finding the Fourth Proportional to 28,605.21, 42,878.03 and 9,615.75

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Solution

The fourth proportional to 28,605.21, 42,878.03 and 9,615.75 is: 14,413.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,605.21 : 42,878.03 = 9,615.75 : x
  2. Step 2: Convert to fraction form
    28,605.21/42,878.03 = 9,615.75/x
  3. Step 3: Cross multiply
    28,605.21x = 42,878.03 × 9,615.75
  4. Step 4: Simplify right side
    28,605.21x = 412,304,368.89
  5. Step 5: Solve for x
    x = 412,304,368.89/28,605.21
  6. Step 6: Final answer
    x = 14,413.61

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1.5x scale

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.