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Finding the Fourth Proportional to 1,281.63, 1,769.59 and 784.95

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Solution

The fourth proportional to 1,281.63, 1,769.59 and 784.95 is: 1,083.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.63 : 1,769.59 = 784.95 : x
  2. Step 2: Convert to fraction form
    1,281.63/1,769.59 = 784.95/x
  3. Step 3: Cross multiply
    1,281.63x = 1,769.59 × 784.95
  4. Step 4: Simplify right side
    1,281.63x = 1,389,039.67
  5. Step 5: Solve for x
    x = 1,389,039.67/1,281.63
  6. Step 6: Final answer
    x = 1,083.81

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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.