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Finding the Fourth Proportional to 1,080.42, 1,489.14 and 987.45

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Solution

The fourth proportional to 1,080.42, 1,489.14 and 987.45 is: 1,361.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.42 : 1,489.14 = 987.45 : x
  2. Step 2: Convert to fraction form
    1,080.42/1,489.14 = 987.45/x
  3. Step 3: Cross multiply
    1,080.42x = 1,489.14 × 987.45
  4. Step 4: Simplify right side
    1,080.42x = 1,470,451.29
  5. Step 5: Solve for x
    x = 1,470,451.29/1,080.42
  6. Step 6: Final answer
    x = 1,361.00

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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.