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Finding the Fourth Proportional to 1,076.75, 1,485.68 and 634.67

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Solution

The fourth proportional to 1,076.75, 1,485.68 and 634.67 is: 875.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.75 : 1,485.68 = 634.67 : x
  2. Step 2: Convert to fraction form
    1,076.75/1,485.68 = 634.67/x
  3. Step 3: Cross multiply
    1,076.75x = 1,485.68 × 634.67
  4. Step 4: Simplify right side
    1,076.75x = 942,913.35
  5. Step 5: Solve for x
    x = 942,913.35/1,076.75
  6. Step 6: Final answer
    x = 875.70

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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.