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Finding the Fourth Proportional to 933.59, 1,288.90 and 619.28

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Solution

The fourth proportional to 933.59, 1,288.90 and 619.28 is: 854.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.59 : 1,288.90 = 619.28 : x
  2. Step 2: Convert to fraction form
    933.59/1,288.90 = 619.28/x
  3. Step 3: Cross multiply
    933.59x = 1,288.90 × 619.28
  4. Step 4: Simplify right side
    933.59x = 798,193.80
  5. Step 5: Solve for x
    x = 798,193.80/933.59
  6. Step 6: Final answer
    x = 854.97

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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.