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Finding the Fourth Proportional to 1,015.20, 1,399.68 and 818.16

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Solution

The fourth proportional to 1,015.20, 1,399.68 and 818.16 is: 1,128.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.20 : 1,399.68 = 818.16 : x
  2. Step 2: Convert to fraction form
    1,015.20/1,399.68 = 818.16/x
  3. Step 3: Cross multiply
    1,015.20x = 1,399.68 × 818.16
  4. Step 4: Simplify right side
    1,015.20x = 1,145,162.19
  5. Step 5: Solve for x
    x = 1,145,162.19/1,015.20
  6. Step 6: Final answer
    x = 1,128.02

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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.