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Finding the Fourth Proportional to 675.90, 931.77 and 619.20

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Solution

The fourth proportional to 675.90, 931.77 and 619.20 is: 853.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.90 : 931.77 = 619.20 : x
  2. Step 2: Convert to fraction form
    675.90/931.77 = 619.20/x
  3. Step 3: Cross multiply
    675.90x = 931.77 × 619.20
  4. Step 4: Simplify right side
    675.90x = 576,951.98
  5. Step 5: Solve for x
    x = 576,951.98/675.90
  6. Step 6: Final answer
    x = 853.61

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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.