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Finding the Fourth Proportional to 1,000.84, 1,380.76 and 685.60

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Solution

The fourth proportional to 1,000.84, 1,380.76 and 685.60 is: 945.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.84 : 1,380.76 = 685.60 : x
  2. Step 2: Convert to fraction form
    1,000.84/1,380.76 = 685.60/x
  3. Step 3: Cross multiply
    1,000.84x = 1,380.76 × 685.60
  4. Step 4: Simplify right side
    1,000.84x = 946,649.06
  5. Step 5: Solve for x
    x = 946,649.06/1,000.84
  6. Step 6: Final answer
    x = 945.85

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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.