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Finding the Fourth Proportional to 678.66, 930.83 and 627.63

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Solution

The fourth proportional to 678.66, 930.83 and 627.63 is: 860.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.66 : 930.83 = 627.63 : x
  2. Step 2: Convert to fraction form
    678.66/930.83 = 627.63/x
  3. Step 3: Cross multiply
    678.66x = 930.83 × 627.63
  4. Step 4: Simplify right side
    678.66x = 584,213.69
  5. Step 5: Solve for x
    x = 584,213.69/678.66
  6. Step 6: Final answer
    x = 860.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.