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Finding the Fourth Proportional to 1,397.35, 2,097.55 and 812.99

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Solution

The fourth proportional to 1,397.35, 2,097.55 and 812.99 is: 1,220.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.35 : 2,097.55 = 812.99 : x
  2. Step 2: Convert to fraction form
    1,397.35/2,097.55 = 812.99/x
  3. Step 3: Cross multiply
    1,397.35x = 2,097.55 × 812.99
  4. Step 4: Simplify right side
    1,397.35x = 1,705,277.06
  5. Step 5: Solve for x
    x = 1,705,277.06/1,397.35
  6. Step 6: Final answer
    x = 1,220.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.