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Finding the Fourth Proportional to 742.36, 1,022.50 and 689.20

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Solution

The fourth proportional to 742.36, 1,022.50 and 689.20 is: 949.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.36 : 1,022.50 = 689.20 : x
  2. Step 2: Convert to fraction form
    742.36/1,022.50 = 689.20/x
  3. Step 3: Cross multiply
    742.36x = 1,022.50 × 689.20
  4. Step 4: Simplify right side
    742.36x = 704,707
  5. Step 5: Solve for x
    x = 704,707/742.36
  6. Step 6: Final answer
    x = 949.28

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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.