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Finding the Fourth Proportional to 554.63, 765.32 and 305.91

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Solution

The fourth proportional to 554.63, 765.32 and 305.91 is: 422.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.63 : 765.32 = 305.91 : x
  2. Step 2: Convert to fraction form
    554.63/765.32 = 305.91/x
  3. Step 3: Cross multiply
    554.63x = 765.32 × 305.91
  4. Step 4: Simplify right side
    554.63x = 234,117.51
  5. Step 5: Solve for x
    x = 234,117.51/554.63
  6. Step 6: Final answer
    x = 422.12

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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.