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Finding the Fourth Proportional to 843.40, 1,263.38 and 431.51

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Solution

The fourth proportional to 843.40, 1,263.38 and 431.51 is: 646.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.40 : 1,263.38 = 431.51 : x
  2. Step 2: Convert to fraction form
    843.40/1,263.38 = 431.51/x
  3. Step 3: Cross multiply
    843.40x = 1,263.38 × 431.51
  4. Step 4: Simplify right side
    843.40x = 545,161.10
  5. Step 5: Solve for x
    x = 545,161.10/843.40
  6. Step 6: Final answer
    x = 646.39

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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.