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Finding the Fourth Proportional to 555.26, 765.52 and 485.60

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Solution

The fourth proportional to 555.26, 765.52 and 485.60 is: 669.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.26 : 765.52 = 485.60 : x
  2. Step 2: Convert to fraction form
    555.26/765.52 = 485.60/x
  3. Step 3: Cross multiply
    555.26x = 765.52 × 485.60
  4. Step 4: Simplify right side
    555.26x = 371,731.47
  5. Step 5: Solve for x
    x = 371,731.47/555.26
  6. Step 6: Final answer
    x = 669.48

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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.