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Finding the Fourth Proportional to 765.36, 1,057.32 and 661.68

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Solution

The fourth proportional to 765.36, 1,057.32 and 661.68 is: 914.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.36 : 1,057.32 = 661.68 : x
  2. Step 2: Convert to fraction form
    765.36/1,057.32 = 661.68/x
  3. Step 3: Cross multiply
    765.36x = 1,057.32 × 661.68
  4. Step 4: Simplify right side
    765.36x = 699,607.50
  5. Step 5: Solve for x
    x = 699,607.50/765.36
  6. Step 6: Final answer
    x = 914.09

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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.