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Finding the Fourth Proportional to 554.47, 765.18 and 305.79

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Solution

The fourth proportional to 554.47, 765.18 and 305.79 is: 421.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.47 : 765.18 = 305.79 : x
  2. Step 2: Convert to fraction form
    554.47/765.18 = 305.79/x
  3. Step 3: Cross multiply
    554.47x = 765.18 × 305.79
  4. Step 4: Simplify right side
    554.47x = 233,981.52
  5. Step 5: Solve for x
    x = 233,981.52/554.47
  6. Step 6: Final answer
    x = 421.99

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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.