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Finding the Fourth Proportional to 1,343.28, 1,854 and 783.66

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Solution

The fourth proportional to 1,343.28, 1,854 and 783.66 is: 1,081.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,343.28 : 1,854 = 783.66 : x
  2. Step 2: Convert to fraction form
    1,343.28/1,854 = 783.66/x
  3. Step 3: Cross multiply
    1,343.28x = 1,854 × 783.66
  4. Step 4: Simplify right side
    1,343.28x = 1,452,905.64
  5. Step 5: Solve for x
    x = 1,452,905.64/1,343.28
  6. Step 6: Final answer
    x = 1,081.61

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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.