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Finding the Fourth Proportional to 488.80, 734.74 and 455

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Solution

The fourth proportional to 488.80, 734.74 and 455 is: 683.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.80 : 734.74 = 455 : x
  2. Step 2: Convert to fraction form
    488.80/734.74 = 455/x
  3. Step 3: Cross multiply
    488.80x = 734.74 × 455
  4. Step 4: Simplify right side
    488.80x = 334,306.70
  5. Step 5: Solve for x
    x = 334,306.70/488.80
  6. Step 6: Final answer
    x = 683.93

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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.