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Finding the Fourth Proportional to 1,319.00, 1,820.57 and 821.33

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Solution

The fourth proportional to 1,319.00, 1,820.57 and 821.33 is: 1,133.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.00 : 1,820.57 = 821.33 : x
  2. Step 2: Convert to fraction form
    1,319.00/1,820.57 = 821.33/x
  3. Step 3: Cross multiply
    1,319.00x = 1,820.57 × 821.33
  4. Step 4: Simplify right side
    1,319.00x = 1,495,275.55
  5. Step 5: Solve for x
    x = 1,495,275.55/1,319.00
  6. Step 6: Final answer
    x = 1,133.65

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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.