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Finding the Fourth Proportional to 894.22, 1,339.63 and 430.63

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Solution

The fourth proportional to 894.22, 1,339.63 and 430.63 is: 645.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    894.22 : 1,339.63 = 430.63 : x
  2. Step 2: Convert to fraction form
    894.22/1,339.63 = 430.63/x
  3. Step 3: Cross multiply
    894.22x = 1,339.63 × 430.63
  4. Step 4: Simplify right side
    894.22x = 576,884.87
  5. Step 5: Solve for x
    x = 576,884.87/894.22
  6. Step 6: Final answer
    x = 645.13

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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.