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Finding the Fourth Proportional to 619.99, 854.84 and 486.95

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Solution

The fourth proportional to 619.99, 854.84 and 486.95 is: 671.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.99 : 854.84 = 486.95 : x
  2. Step 2: Convert to fraction form
    619.99/854.84 = 486.95/x
  3. Step 3: Cross multiply
    619.99x = 854.84 × 486.95
  4. Step 4: Simplify right side
    619.99x = 416,261.28
  5. Step 5: Solve for x
    x = 416,261.28/619.99
  6. Step 6: Final answer
    x = 671.40

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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.