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Finding the Fourth Proportional to 1,281.23, 1,768.16 and 783.71

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Solution

The fourth proportional to 1,281.23, 1,768.16 and 783.71 is: 1,081.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.23 : 1,768.16 = 783.71 : x
  2. Step 2: Convert to fraction form
    1,281.23/1,768.16 = 783.71/x
  3. Step 3: Cross multiply
    1,281.23x = 1,768.16 × 783.71
  4. Step 4: Simplify right side
    1,281.23x = 1,385,730.07
  5. Step 5: Solve for x
    x = 1,385,730.07/1,281.23
  6. Step 6: Final answer
    x = 1,081.56

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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.