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Finding the Fourth Proportional to 1,344.18, 1,855 and 784.81

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Solution

The fourth proportional to 1,344.18, 1,855 and 784.81 is: 1,083.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,344.18 : 1,855 = 784.81 : x
  2. Step 2: Convert to fraction form
    1,344.18/1,855 = 784.81/x
  3. Step 3: Cross multiply
    1,344.18x = 1,855 × 784.81
  4. Step 4: Simplify right side
    1,344.18x = 1,455,822.55
  5. Step 5: Solve for x
    x = 1,455,822.55/1,344.18
  6. Step 6: Final answer
    x = 1,083.06

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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.