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Finding the Fourth Proportional to 1,920, 2,881.28 and 704

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Solution

The fourth proportional to 1,920, 2,881.28 and 704 is: 1,056.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920 : 2,881.28 = 704 : x
  2. Step 2: Convert to fraction form
    1,920/2,881.28 = 704/x
  3. Step 3: Cross multiply
    1,920x = 2,881.28 × 704
  4. Step 4: Simplify right side
    1,920x = 2,028,421.12
  5. Step 5: Solve for x
    x = 2,028,421.12/1,920
  6. Step 6: Final answer
    x = 1,056.47

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