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Finding the Fourth Proportional to 1,287.63, 1,777.33 and 821.88

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Solution

The fourth proportional to 1,287.63, 1,777.33 and 821.88 is: 1,134.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.63 : 1,777.33 = 821.88 : x
  2. Step 2: Convert to fraction form
    1,287.63/1,777.33 = 821.88/x
  3. Step 3: Cross multiply
    1,287.63x = 1,777.33 × 821.88
  4. Step 4: Simplify right side
    1,287.63x = 1,460,751.98
  5. Step 5: Solve for x
    x = 1,460,751.98/1,287.63
  6. Step 6: Final answer
    x = 1,134.45

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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.