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Finding the Fourth Proportional to 495.55, 683.07 and 485.83

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Solution

The fourth proportional to 495.55, 683.07 and 485.83 is: 669.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.55 : 683.07 = 485.83 : x
  2. Step 2: Convert to fraction form
    495.55/683.07 = 485.83/x
  3. Step 3: Cross multiply
    495.55x = 683.07 × 485.83
  4. Step 4: Simplify right side
    495.55x = 331,854.93
  5. Step 5: Solve for x
    x = 331,854.93/495.55
  6. Step 6: Final answer
    x = 669.67

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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.