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Finding the Fourth Proportional to 1,386.85, 1,913.48 and 827.06

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Solution

The fourth proportional to 1,386.85, 1,913.48 and 827.06 is: 1,141.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.85 : 1,913.48 = 827.06 : x
  2. Step 2: Convert to fraction form
    1,386.85/1,913.48 = 827.06/x
  3. Step 3: Cross multiply
    1,386.85x = 1,913.48 × 827.06
  4. Step 4: Simplify right side
    1,386.85x = 1,582,558.63
  5. Step 5: Solve for x
    x = 1,582,558.63/1,386.85
  6. Step 6: Final answer
    x = 1,141.12

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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.