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Finding the Fourth Proportional to 982.77, 1,355.77 and 870.85

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Solution

The fourth proportional to 982.77, 1,355.77 and 870.85 is: 1,201.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.77 : 1,355.77 = 870.85 : x
  2. Step 2: Convert to fraction form
    982.77/1,355.77 = 870.85/x
  3. Step 3: Cross multiply
    982.77x = 1,355.77 × 870.85
  4. Step 4: Simplify right side
    982.77x = 1,180,672.30
  5. Step 5: Solve for x
    x = 1,180,672.30/982.77
  6. Step 6: Final answer
    x = 1,201.37

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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.