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Finding the Fourth Proportional to 1,315.40, 1,815.44 and 818.16

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Solution

The fourth proportional to 1,315.40, 1,815.44 and 818.16 is: 1,129.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.40 : 1,815.44 = 818.16 : x
  2. Step 2: Convert to fraction form
    1,315.40/1,815.44 = 818.16/x
  3. Step 3: Cross multiply
    1,315.40x = 1,815.44 × 818.16
  4. Step 4: Simplify right side
    1,315.40x = 1,485,320.39
  5. Step 5: Solve for x
    x = 1,485,320.39/1,315.40
  6. Step 6: Final answer
    x = 1,129.18

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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.