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Finding the Fourth Proportional to 445.76, 615.18 and 290.51

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Solution

The fourth proportional to 445.76, 615.18 and 290.51 is: 400.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.76 : 615.18 = 290.51 : x
  2. Step 2: Convert to fraction form
    445.76/615.18 = 290.51/x
  3. Step 3: Cross multiply
    445.76x = 615.18 × 290.51
  4. Step 4: Simplify right side
    445.76x = 178,715.94
  5. Step 5: Solve for x
    x = 178,715.94/445.76
  6. Step 6: Final answer
    x = 400.92

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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.