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Finding the Fourth Proportional to 619.51, 854.93 and 486.90

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Solution

The fourth proportional to 619.51, 854.93 and 486.90 is: 671.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.51 : 854.93 = 486.90 : x
  2. Step 2: Convert to fraction form
    619.51/854.93 = 486.90/x
  3. Step 3: Cross multiply
    619.51x = 854.93 × 486.90
  4. Step 4: Simplify right side
    619.51x = 416,265.42
  5. Step 5: Solve for x
    x = 416,265.42/619.51
  6. Step 6: Final answer
    x = 671.93

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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.