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Finding the Fourth Proportional to 1,347.24, 2,021.52 and 861.24

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Solution

The fourth proportional to 1,347.24, 2,021.52 and 861.24 is: 1,292.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.24 : 2,021.52 = 861.24 : x
  2. Step 2: Convert to fraction form
    1,347.24/2,021.52 = 861.24/x
  3. Step 3: Cross multiply
    1,347.24x = 2,021.52 × 861.24
  4. Step 4: Simplify right side
    1,347.24x = 1,741,013.88
  5. Step 5: Solve for x
    x = 1,741,013.88/1,347.24
  6. Step 6: Final answer
    x = 1,292.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.