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Finding the Fourth Proportional to 765.21, 1,055.52 and 667.20

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Solution

The fourth proportional to 765.21, 1,055.52 and 667.20 is: 920.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.21 : 1,055.52 = 667.20 : x
  2. Step 2: Convert to fraction form
    765.21/1,055.52 = 667.20/x
  3. Step 3: Cross multiply
    765.21x = 1,055.52 × 667.20
  4. Step 4: Simplify right side
    765.21x = 704,242.94
  5. Step 5: Solve for x
    x = 704,242.94/765.21
  6. Step 6: Final answer
    x = 920.33

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1.5x scale

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.