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Finding the Fourth Proportional to 290.19, 435.38 and 84.77

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Solution

The fourth proportional to 290.19, 435.38 and 84.77 is: 127.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.19 : 435.38 = 84.77 : x
  2. Step 2: Convert to fraction form
    290.19/435.38 = 84.77/x
  3. Step 3: Cross multiply
    290.19x = 435.38 × 84.77
  4. Step 4: Simplify right side
    290.19x = 36,904.56
  5. Step 5: Solve for x
    x = 36,904.56/290.19
  6. Step 6: Final answer
    x = 127.17

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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.