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Finding the Fourth Proportional to 762.21, 1,051.38 and 664.20

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Solution

The fourth proportional to 762.21, 1,051.38 and 664.20 is: 916.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.21 : 1,051.38 = 664.20 : x
  2. Step 2: Convert to fraction form
    762.21/1,051.38 = 664.20/x
  3. Step 3: Cross multiply
    762.21x = 1,051.38 × 664.20
  4. Step 4: Simplify right side
    762.21x = 698,326.60
  5. Step 5: Solve for x
    x = 698,326.60/762.21
  6. Step 6: Final answer
    x = 916.19

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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.