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Finding the Fourth Proportional to 683.44, 943.10 and 388.71

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Solution

The fourth proportional to 683.44, 943.10 and 388.71 is: 536.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.44 : 943.10 = 388.71 : x
  2. Step 2: Convert to fraction form
    683.44/943.10 = 388.71/x
  3. Step 3: Cross multiply
    683.44x = 943.10 × 388.71
  4. Step 4: Simplify right side
    683.44x = 366,592.40
  5. Step 5: Solve for x
    x = 366,592.40/683.44
  6. Step 6: Final answer
    x = 536.39

Related Problems

Find fourth proportional to 341.72, 471.55 and 194.36
Half scale
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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.