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Finding the Fourth Proportional to 1,284.48, 1,770.30 and 990.45

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Solution

The fourth proportional to 1,284.48, 1,770.30 and 990.45 is: 1,365.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.48 : 1,770.30 = 990.45 : x
  2. Step 2: Convert to fraction form
    1,284.48/1,770.30 = 990.45/x
  3. Step 3: Cross multiply
    1,284.48x = 1,770.30 × 990.45
  4. Step 4: Simplify right side
    1,284.48x = 1,753,393.64
  5. Step 5: Solve for x
    x = 1,753,393.64/1,284.48
  6. Step 6: Final answer
    x = 1,365.06

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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.