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Finding the Fourth Proportional to 1,455.16, 2,008.56 and 989.68

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Solution

The fourth proportional to 1,455.16, 2,008.56 and 989.68 is: 1,366.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.16 : 2,008.56 = 989.68 : x
  2. Step 2: Convert to fraction form
    1,455.16/2,008.56 = 989.68/x
  3. Step 3: Cross multiply
    1,455.16x = 2,008.56 × 989.68
  4. Step 4: Simplify right side
    1,455.16x = 1,987,831.66
  5. Step 5: Solve for x
    x = 1,987,831.66/1,455.16
  6. Step 6: Final answer
    x = 1,366.06

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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.