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Finding the Fourth Proportional to 691.99, 955.12 and 482.20

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Solution

The fourth proportional to 691.99, 955.12 and 482.20 is: 665.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.99 : 955.12 = 482.20 : x
  2. Step 2: Convert to fraction form
    691.99/955.12 = 482.20/x
  3. Step 3: Cross multiply
    691.99x = 955.12 × 482.20
  4. Step 4: Simplify right side
    691.99x = 460,558.86
  5. Step 5: Solve for x
    x = 460,558.86/691.99
  6. Step 6: Final answer
    x = 665.56

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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.