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Finding the Fourth Proportional to 1,408.76, 1,943.30 and 819.23

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Solution

The fourth proportional to 1,408.76, 1,943.30 and 819.23 is: 1,130.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.76 : 1,943.30 = 819.23 : x
  2. Step 2: Convert to fraction form
    1,408.76/1,943.30 = 819.23/x
  3. Step 3: Cross multiply
    1,408.76x = 1,943.30 × 819.23
  4. Step 4: Simplify right side
    1,408.76x = 1,591,999.94
  5. Step 5: Solve for x
    x = 1,591,999.94/1,408.76
  6. Step 6: Final answer
    x = 1,130.08

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1.5x scale

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.