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Finding the Fourth Proportional to 563.16, 778.20 and 407.64

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Solution

The fourth proportional to 563.16, 778.20 and 407.64 is: 563.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.16 : 778.20 = 407.64 : x
  2. Step 2: Convert to fraction form
    563.16/778.20 = 407.64/x
  3. Step 3: Cross multiply
    563.16x = 778.20 × 407.64
  4. Step 4: Simplify right side
    563.16x = 317,225.45
  5. Step 5: Solve for x
    x = 317,225.45/563.16
  6. Step 6: Final answer
    x = 563.30

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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.