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Finding the Fourth Proportional to 1,728, 2,384.68 and 981.84

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Solution

The fourth proportional to 1,728, 2,384.68 and 981.84 is: 1,354.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728 : 2,384.68 = 981.84 : x
  2. Step 2: Convert to fraction form
    1,728/2,384.68 = 981.84/x
  3. Step 3: Cross multiply
    1,728x = 2,384.68 × 981.84
  4. Step 4: Simplify right side
    1,728x = 2,341,374.21
  5. Step 5: Solve for x
    x = 2,341,374.21/1,728
  6. Step 6: Final answer
    x = 1,354.96

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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.