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Finding the Fourth Proportional to 484.46, 669.21 and 386.90

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Solution

The fourth proportional to 484.46, 669.21 and 386.90 is: 534.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.46 : 669.21 = 386.90 : x
  2. Step 2: Convert to fraction form
    484.46/669.21 = 386.90/x
  3. Step 3: Cross multiply
    484.46x = 669.21 × 386.90
  4. Step 4: Simplify right side
    484.46x = 258,917.35
  5. Step 5: Solve for x
    x = 258,917.35/484.46
  6. Step 6: Final answer
    x = 534.45

Related Problems

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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.