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Finding the Fourth Proportional to 678.94, 930.52 and 670.30

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Solution

The fourth proportional to 678.94, 930.52 and 670.30 is: 918.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.94 : 930.52 = 670.30 : x
  2. Step 2: Convert to fraction form
    678.94/930.52 = 670.30/x
  3. Step 3: Cross multiply
    678.94x = 930.52 × 670.30
  4. Step 4: Simplify right side
    678.94x = 623,727.56
  5. Step 5: Solve for x
    x = 623,727.56/678.94
  6. Step 6: Final answer
    x = 918.68

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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.