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Finding the Fourth Proportional to 1,086, 1,498.68 and 620.24

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Solution

The fourth proportional to 1,086, 1,498.68 and 620.24 is: 855.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086 : 1,498.68 = 620.24 : x
  2. Step 2: Convert to fraction form
    1,086/1,498.68 = 620.24/x
  3. Step 3: Cross multiply
    1,086x = 1,498.68 × 620.24
  4. Step 4: Simplify right side
    1,086x = 929,541.28
  5. Step 5: Solve for x
    x = 929,541.28/1,086
  6. Step 6: Final answer
    x = 855.93

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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.