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Finding the Fourth Proportional to 485.37, 669.59 and 288.77

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Solution

The fourth proportional to 485.37, 669.59 and 288.77 is: 398.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.37 : 669.59 = 288.77 : x
  2. Step 2: Convert to fraction form
    485.37/669.59 = 288.77/x
  3. Step 3: Cross multiply
    485.37x = 669.59 × 288.77
  4. Step 4: Simplify right side
    485.37x = 193,357.50
  5. Step 5: Solve for x
    x = 193,357.50/485.37
  6. Step 6: Final answer
    x = 398.37

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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.