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Finding the Fourth Proportional to 1,305.21, 1,801.23 and 715.79

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Solution

The fourth proportional to 1,305.21, 1,801.23 and 715.79 is: 987.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.21 : 1,801.23 = 715.79 : x
  2. Step 2: Convert to fraction form
    1,305.21/1,801.23 = 715.79/x
  3. Step 3: Cross multiply
    1,305.21x = 1,801.23 × 715.79
  4. Step 4: Simplify right side
    1,305.21x = 1,289,302.42
  5. Step 5: Solve for x
    x = 1,289,302.42/1,305.21
  6. Step 6: Final answer
    x = 987.81

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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.