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Finding the Fourth Proportional to 1,176.21, 1,623.02 and 678.78

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Solution

The fourth proportional to 1,176.21, 1,623.02 and 678.78 is: 936.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,176.21 : 1,623.02 = 678.78 : x
  2. Step 2: Convert to fraction form
    1,176.21/1,623.02 = 678.78/x
  3. Step 3: Cross multiply
    1,176.21x = 1,623.02 × 678.78
  4. Step 4: Simplify right side
    1,176.21x = 1,101,670.12
  5. Step 5: Solve for x
    x = 1,101,670.12/1,176.21
  6. Step 6: Final answer
    x = 936.63

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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.