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Finding the Fourth Proportional to 1,027.69, 1,418.09 and 818.40

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Solution

The fourth proportional to 1,027.69, 1,418.09 and 818.40 is: 1,129.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,027.69 : 1,418.09 = 818.40 : x
  2. Step 2: Convert to fraction form
    1,027.69/1,418.09 = 818.40/x
  3. Step 3: Cross multiply
    1,027.69x = 1,418.09 × 818.40
  4. Step 4: Simplify right side
    1,027.69x = 1,160,559.81
  5. Step 5: Solve for x
    x = 1,160,559.81/1,027.69
  6. Step 6: Final answer
    x = 1,129.29

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1.5x scale

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.