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Finding the Fourth Proportional to 624.99, 863.19 and 486.77

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Solution

The fourth proportional to 624.99, 863.19 and 486.77 is: 672.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.99 : 863.19 = 486.77 : x
  2. Step 2: Convert to fraction form
    624.99/863.19 = 486.77/x
  3. Step 3: Cross multiply
    624.99x = 863.19 × 486.77
  4. Step 4: Simplify right side
    624.99x = 420,172.56
  5. Step 5: Solve for x
    x = 420,172.56/624.99
  6. Step 6: Final answer
    x = 672.29

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1.5x scale

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.