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Finding the Fourth Proportional to 557.99, 769.40 and 380.90

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Solution

The fourth proportional to 557.99, 769.40 and 380.90 is: 525.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.99 : 769.40 = 380.90 : x
  2. Step 2: Convert to fraction form
    557.99/769.40 = 380.90/x
  3. Step 3: Cross multiply
    557.99x = 769.40 × 380.90
  4. Step 4: Simplify right side
    557.99x = 293,065.91
  5. Step 5: Solve for x
    x = 293,065.91/557.99
  6. Step 6: Final answer
    x = 525.22

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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.