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Finding the Fourth Proportional to 554.18, 764.80 and 305.51

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Solution

The fourth proportional to 554.18, 764.80 and 305.51 is: 421.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.18 : 764.80 = 305.51 : x
  2. Step 2: Convert to fraction form
    554.18/764.80 = 305.51/x
  3. Step 3: Cross multiply
    554.18x = 764.80 × 305.51
  4. Step 4: Simplify right side
    554.18x = 233,649.46
  5. Step 5: Solve for x
    x = 233,649.46/554.18
  6. Step 6: Final answer
    x = 421.61

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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.