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Finding the Fourth Proportional to 522.20, 720.40 and 312.16

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Solution

The fourth proportional to 522.20, 720.40 and 312.16 is: 430.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.20 : 720.40 = 312.16 : x
  2. Step 2: Convert to fraction form
    522.20/720.40 = 312.16/x
  3. Step 3: Cross multiply
    522.20x = 720.40 × 312.16
  4. Step 4: Simplify right side
    522.20x = 224,880.06
  5. Step 5: Solve for x
    x = 224,880.06/522.20
  6. Step 6: Final answer
    x = 430.64

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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.