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Finding the Fourth Proportional to 475.16, 655.47 and 386.78

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Solution

The fourth proportional to 475.16, 655.47 and 386.78 is: 533.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.16 : 655.47 = 386.78 : x
  2. Step 2: Convert to fraction form
    475.16/655.47 = 386.78/x
  3. Step 3: Cross multiply
    475.16x = 655.47 × 386.78
  4. Step 4: Simplify right side
    475.16x = 253,519.41
  5. Step 5: Solve for x
    x = 253,519.41/475.16
  6. Step 6: Final answer
    x = 533.55

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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.