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Finding the Fourth Proportional to 935, 1,290.36 and 619.72

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Solution

The fourth proportional to 935, 1,290.36 and 619.72 is: 855.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    935 : 1,290.36 = 619.72 : x
  2. Step 2: Convert to fraction form
    935/1,290.36 = 619.72/x
  3. Step 3: Cross multiply
    935x = 1,290.36 × 619.72
  4. Step 4: Simplify right side
    935x = 799,661.90
  5. Step 5: Solve for x
    x = 799,661.90/935
  6. Step 6: Final answer
    x = 855.25

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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.