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Finding the Fourth Proportional to 445.68, 614.88 and 290.16

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Solution

The fourth proportional to 445.68, 614.88 and 290.16 is: 400.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.68 : 614.88 = 290.16 : x
  2. Step 2: Convert to fraction form
    445.68/614.88 = 290.16/x
  3. Step 3: Cross multiply
    445.68x = 614.88 × 290.16
  4. Step 4: Simplify right side
    445.68x = 178,413.58
  5. Step 5: Solve for x
    x = 178,413.58/445.68
  6. Step 6: Final answer
    x = 400.32

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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.