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Finding the Fourth Proportional to 554.89, 765.36 and 389.05

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Solution

The fourth proportional to 554.89, 765.36 and 389.05 is: 536.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.89 : 765.36 = 389.05 : x
  2. Step 2: Convert to fraction form
    554.89/765.36 = 389.05/x
  3. Step 3: Cross multiply
    554.89x = 765.36 × 389.05
  4. Step 4: Simplify right side
    554.89x = 297,763.31
  5. Step 5: Solve for x
    x = 297,763.31/554.89
  6. Step 6: Final answer
    x = 536.62

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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.