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Finding the Fourth Proportional to 18,712.16, 28,048.72 and 7,614.40

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Solution

The fourth proportional to 18,712.16, 28,048.72 and 7,614.40 is: 11,413.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.16 : 28,048.72 = 7,614.40 : x
  2. Step 2: Convert to fraction form
    18,712.16/28,048.72 = 7,614.40/x
  3. Step 3: Cross multiply
    18,712.16x = 28,048.72 × 7,614.40
  4. Step 4: Simplify right side
    18,712.16x = 213,574,173.57
  5. Step 5: Solve for x
    x = 213,574,173.57/18,712.16
  6. Step 6: Final answer
    x = 11,413.66

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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.