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Finding the Fourth Proportional to 651.80, 898.26 and 485.84

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Solution

The fourth proportional to 651.80, 898.26 and 485.84 is: 669.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.80 : 898.26 = 485.84 : x
  2. Step 2: Convert to fraction form
    651.80/898.26 = 485.84/x
  3. Step 3: Cross multiply
    651.80x = 898.26 × 485.84
  4. Step 4: Simplify right side
    651.80x = 436,410.64
  5. Step 5: Solve for x
    x = 436,410.64/651.80
  6. Step 6: Final answer
    x = 669.55

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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.