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Finding the Fourth Proportional to 522.22, 720.40 and 485.16

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Solution

The fourth proportional to 522.22, 720.40 and 485.16 is: 669.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.22 : 720.40 = 485.16 : x
  2. Step 2: Convert to fraction form
    522.22/720.40 = 485.16/x
  3. Step 3: Cross multiply
    522.22x = 720.40 × 485.16
  4. Step 4: Simplify right side
    522.22x = 349,509.26
  5. Step 5: Solve for x
    x = 349,509.26/522.22
  6. Step 6: Final answer
    x = 669.28

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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.