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Finding the Fourth Proportional to 291.76, 434.49 and 290.32

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Solution

The fourth proportional to 291.76, 434.49 and 290.32 is: 432.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.76 : 434.49 = 290.32 : x
  2. Step 2: Convert to fraction form
    291.76/434.49 = 290.32/x
  3. Step 3: Cross multiply
    291.76x = 434.49 × 290.32
  4. Step 4: Simplify right side
    291.76x = 126,141.14
  5. Step 5: Solve for x
    x = 126,141.14/291.76
  6. Step 6: Final answer
    x = 432.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.