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Finding the Fourth Proportional to 1,374.40, 1,896.65 and 784.89

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Solution

The fourth proportional to 1,374.40, 1,896.65 and 784.89 is: 1,083.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.40 : 1,896.65 = 784.89 : x
  2. Step 2: Convert to fraction form
    1,374.40/1,896.65 = 784.89/x
  3. Step 3: Cross multiply
    1,374.40x = 1,896.65 × 784.89
  4. Step 4: Simplify right side
    1,374.40x = 1,488,660.64
  5. Step 5: Solve for x
    x = 1,488,660.64/1,374.40
  6. Step 6: Final answer
    x = 1,083.13

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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.