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Finding the Fourth Proportional to 1,408.20, 1,943.94 and 929.64

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Solution

The fourth proportional to 1,408.20, 1,943.94 and 929.64 is: 1,283.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.20 : 1,943.94 = 929.64 : x
  2. Step 2: Convert to fraction form
    1,408.20/1,943.94 = 929.64/x
  3. Step 3: Cross multiply
    1,408.20x = 1,943.94 × 929.64
  4. Step 4: Simplify right side
    1,408.20x = 1,807,164.38
  5. Step 5: Solve for x
    x = 1,807,164.38/1,408.20
  6. Step 6: Final answer
    x = 1,283.32

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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.