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Finding the Fourth Proportional to 557.64, 769.53 and 308.92

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Solution

The fourth proportional to 557.64, 769.53 and 308.92 is: 426.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.64 : 769.53 = 308.92 : x
  2. Step 2: Convert to fraction form
    557.64/769.53 = 308.92/x
  3. Step 3: Cross multiply
    557.64x = 769.53 × 308.92
  4. Step 4: Simplify right side
    557.64x = 237,723.21
  5. Step 5: Solve for x
    x = 237,723.21/557.64
  6. Step 6: Final answer
    x = 426.30

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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.