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Finding the Fourth Proportional to 1,319.97, 1,821.62 and 730.50

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Solution

The fourth proportional to 1,319.97, 1,821.62 and 730.50 is: 1,008.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.97 : 1,821.62 = 730.50 : x
  2. Step 2: Convert to fraction form
    1,319.97/1,821.62 = 730.50/x
  3. Step 3: Cross multiply
    1,319.97x = 1,821.62 × 730.50
  4. Step 4: Simplify right side
    1,319.97x = 1,330,689.76
  5. Step 5: Solve for x
    x = 1,330,689.76/1,319.97
  6. Step 6: Final answer
    x = 1,008.12

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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.