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Finding the Fourth Proportional to 486.99, 672.44 and 389.18

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Solution

The fourth proportional to 486.99, 672.44 and 389.18 is: 537.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.99 : 672.44 = 389.18 : x
  2. Step 2: Convert to fraction form
    486.99/672.44 = 389.18/x
  3. Step 3: Cross multiply
    486.99x = 672.44 × 389.18
  4. Step 4: Simplify right side
    486.99x = 261,699.93
  5. Step 5: Solve for x
    x = 261,699.93/486.99
  6. Step 6: Final answer
    x = 537.38

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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.