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Finding the Fourth Proportional to 683.76, 943.12 and 486.88

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Solution

The fourth proportional to 683.76, 943.12 and 486.88 is: 671.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.76 : 943.12 = 486.88 : x
  2. Step 2: Convert to fraction form
    683.76/943.12 = 486.88/x
  3. Step 3: Cross multiply
    683.76x = 943.12 × 486.88
  4. Step 4: Simplify right side
    683.76x = 459,186.27
  5. Step 5: Solve for x
    x = 459,186.27/683.76
  6. Step 6: Final answer
    x = 671.56

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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.