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Finding the Fourth Proportional to 563.60, 845.40 and 389.90

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Solution

The fourth proportional to 563.60, 845.40 and 389.90 is: 584.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.60 : 845.40 = 389.90 : x
  2. Step 2: Convert to fraction form
    563.60/845.40 = 389.90/x
  3. Step 3: Cross multiply
    563.60x = 845.40 × 389.90
  4. Step 4: Simplify right side
    563.60x = 329,621.46
  5. Step 5: Solve for x
    x = 329,621.46/563.60
  6. Step 6: Final answer
    x = 584.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.