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Finding the Fourth Proportional to 823.60, 1,135.72 and 648.88

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Solution

The fourth proportional to 823.60, 1,135.72 and 648.88 is: 894.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.60 : 1,135.72 = 648.88 : x
  2. Step 2: Convert to fraction form
    823.60/1,135.72 = 648.88/x
  3. Step 3: Cross multiply
    823.60x = 1,135.72 × 648.88
  4. Step 4: Simplify right side
    823.60x = 736,945.99
  5. Step 5: Solve for x
    x = 736,945.99/823.60
  6. Step 6: Final answer
    x = 894.79

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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.