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Finding the Fourth Proportional to 1,068.40, 1,473.96 and 819.28

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Solution

The fourth proportional to 1,068.40, 1,473.96 and 819.28 is: 1,130.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.40 : 1,473.96 = 819.28 : x
  2. Step 2: Convert to fraction form
    1,068.40/1,473.96 = 819.28/x
  3. Step 3: Cross multiply
    1,068.40x = 1,473.96 × 819.28
  4. Step 4: Simplify right side
    1,068.40x = 1,207,585.95
  5. Step 5: Solve for x
    x = 1,207,585.95/1,068.40
  6. Step 6: Final answer
    x = 1,130.28

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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.