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Finding the Fourth Proportional to 1,069.34, 1,476.36 and 820.18

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Solution

The fourth proportional to 1,069.34, 1,476.36 and 820.18 is: 1,132.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.34 : 1,476.36 = 820.18 : x
  2. Step 2: Convert to fraction form
    1,069.34/1,476.36 = 820.18/x
  3. Step 3: Cross multiply
    1,069.34x = 1,476.36 × 820.18
  4. Step 4: Simplify right side
    1,069.34x = 1,210,880.94
  5. Step 5: Solve for x
    x = 1,210,880.94/1,069.34
  6. Step 6: Final answer
    x = 1,132.36

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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.