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Finding the Fourth Proportional to 762.09, 1,051.68 and 412.78

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Solution

The fourth proportional to 762.09, 1,051.68 and 412.78 is: 569.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.09 : 1,051.68 = 412.78 : x
  2. Step 2: Convert to fraction form
    762.09/1,051.68 = 412.78/x
  3. Step 3: Cross multiply
    762.09x = 1,051.68 × 412.78
  4. Step 4: Simplify right side
    762.09x = 434,109.84
  5. Step 5: Solve for x
    x = 434,109.84/762.09
  6. Step 6: Final answer
    x = 569.63

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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.