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Finding the Fourth Proportional to 1,328.05, 1,990.36 and 547.17

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Solution

The fourth proportional to 1,328.05, 1,990.36 and 547.17 is: 820.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.05 : 1,990.36 = 547.17 : x
  2. Step 2: Convert to fraction form
    1,328.05/1,990.36 = 547.17/x
  3. Step 3: Cross multiply
    1,328.05x = 1,990.36 × 547.17
  4. Step 4: Simplify right side
    1,328.05x = 1,089,065.28
  5. Step 5: Solve for x
    x = 1,089,065.28/1,328.05
  6. Step 6: Final answer
    x = 820.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.