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Finding the Fourth Proportional to 681.60, 945.60 and 652.80

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Solution

The fourth proportional to 681.60, 945.60 and 652.80 is: 905.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.60 : 945.60 = 652.80 : x
  2. Step 2: Convert to fraction form
    681.60/945.60 = 652.80/x
  3. Step 3: Cross multiply
    681.60x = 945.60 × 652.80
  4. Step 4: Simplify right side
    681.60x = 617,287.68
  5. Step 5: Solve for x
    x = 617,287.68/681.60
  6. Step 6: Final answer
    x = 905.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.