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Finding the Fourth Proportional to 563.76, 845.28 and 320.40

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Solution

The fourth proportional to 563.76, 845.28 and 320.40 is: 480.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.76 : 845.28 = 320.40 : x
  2. Step 2: Convert to fraction form
    563.76/845.28 = 320.40/x
  3. Step 3: Cross multiply
    563.76x = 845.28 × 320.40
  4. Step 4: Simplify right side
    563.76x = 270,827.71
  5. Step 5: Solve for x
    x = 270,827.71/563.76
  6. Step 6: Final answer
    x = 480.40

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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.