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Finding the Fourth Proportional to 476.70, 657.09 and 389.22

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Solution

The fourth proportional to 476.70, 657.09 and 389.22 is: 536.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.70 : 657.09 = 389.22 : x
  2. Step 2: Convert to fraction form
    476.70/657.09 = 389.22/x
  3. Step 3: Cross multiply
    476.70x = 657.09 × 389.22
  4. Step 4: Simplify right side
    476.70x = 255,752.57
  5. Step 5: Solve for x
    x = 255,752.57/476.70
  6. Step 6: Final answer
    x = 536.51

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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.