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Finding the Fourth Proportional to 485.19, 669.60 and 345.33

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Solution

The fourth proportional to 485.19, 669.60 and 345.33 is: 476.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.19 : 669.60 = 345.33 : x
  2. Step 2: Convert to fraction form
    485.19/669.60 = 345.33/x
  3. Step 3: Cross multiply
    485.19x = 669.60 × 345.33
  4. Step 4: Simplify right side
    485.19x = 231,232.97
  5. Step 5: Solve for x
    x = 231,232.97/485.19
  6. Step 6: Final answer
    x = 476.58

Related Problems

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Half scale
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Double scale
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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.