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Finding the Fourth Proportional to 933.45, 1,287.93 and 619.17

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Solution

The fourth proportional to 933.45, 1,287.93 and 619.17 is: 854.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.45 : 1,287.93 = 619.17 : x
  2. Step 2: Convert to fraction form
    933.45/1,287.93 = 619.17/x
  3. Step 3: Cross multiply
    933.45x = 1,287.93 × 619.17
  4. Step 4: Simplify right side
    933.45x = 797,447.62
  5. Step 5: Solve for x
    x = 797,447.62/933.45
  6. Step 6: Final answer
    x = 854.30

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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.