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Finding the Fourth Proportional to 929.82, 1,284.55 and 611.55

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Solution

The fourth proportional to 929.82, 1,284.55 and 611.55 is: 844.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.82 : 1,284.55 = 611.55 : x
  2. Step 2: Convert to fraction form
    929.82/1,284.55 = 611.55/x
  3. Step 3: Cross multiply
    929.82x = 1,284.55 × 611.55
  4. Step 4: Simplify right side
    929.82x = 785,566.55
  5. Step 5: Solve for x
    x = 785,566.55/929.82
  6. Step 6: Final answer
    x = 844.86

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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.