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Finding the Fourth Proportional to 883.70, 1,219.44 and 485.28

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Solution

The fourth proportional to 883.70, 1,219.44 and 485.28 is: 669.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.70 : 1,219.44 = 485.28 : x
  2. Step 2: Convert to fraction form
    883.70/1,219.44 = 485.28/x
  3. Step 3: Cross multiply
    883.70x = 1,219.44 × 485.28
  4. Step 4: Simplify right side
    883.70x = 591,769.84
  5. Step 5: Solve for x
    x = 591,769.84/883.70
  6. Step 6: Final answer
    x = 669.65

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Double scale
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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.