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Finding the Fourth Proportional to 563.49, 777.62 and 311.45

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Solution

The fourth proportional to 563.49, 777.62 and 311.45 is: 429.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.49 : 777.62 = 311.45 : x
  2. Step 2: Convert to fraction form
    563.49/777.62 = 311.45/x
  3. Step 3: Cross multiply
    563.49x = 777.62 × 311.45
  4. Step 4: Simplify right side
    563.49x = 242,188.83
  5. Step 5: Solve for x
    x = 242,188.83/563.49
  6. Step 6: Final answer
    x = 429.80

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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.