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Finding the Fourth Proportional to 1,455.30, 2,008.74 and 989.82

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Solution

The fourth proportional to 1,455.30, 2,008.74 and 989.82 is: 1,366.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.30 : 2,008.74 = 989.82 : x
  2. Step 2: Convert to fraction form
    1,455.30/2,008.74 = 989.82/x
  3. Step 3: Cross multiply
    1,455.30x = 2,008.74 × 989.82
  4. Step 4: Simplify right side
    1,455.30x = 1,988,291.03
  5. Step 5: Solve for x
    x = 1,988,291.03/1,455.30
  6. Step 6: Final answer
    x = 1,366.24

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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.