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Finding the Fourth Proportional to 511.14, 705.28 and 485.19

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Solution

The fourth proportional to 511.14, 705.28 and 485.19 is: 669.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.14 : 705.28 = 485.19 : x
  2. Step 2: Convert to fraction form
    511.14/705.28 = 485.19/x
  3. Step 3: Cross multiply
    511.14x = 705.28 × 485.19
  4. Step 4: Simplify right side
    511.14x = 342,195.86
  5. Step 5: Solve for x
    x = 342,195.86/511.14
  6. Step 6: Final answer
    x = 669.48

Related Problems

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Double scale
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Similar ratio
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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.