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Finding the Fourth Proportional to 317.69, 476.63 and 290.55

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Solution

The fourth proportional to 317.69, 476.63 and 290.55 is: 435.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.69 : 476.63 = 290.55 : x
  2. Step 2: Convert to fraction form
    317.69/476.63 = 290.55/x
  3. Step 3: Cross multiply
    317.69x = 476.63 × 290.55
  4. Step 4: Simplify right side
    317.69x = 138,483.39
  5. Step 5: Solve for x
    x = 138,483.39/317.69
  6. Step 6: Final answer
    x = 435.91

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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.