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Finding the Fourth Proportional to 884.60, 1,220.79 and 491.63

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Solution

The fourth proportional to 884.60, 1,220.79 and 491.63 is: 678.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.60 : 1,220.79 = 491.63 : x
  2. Step 2: Convert to fraction form
    884.60/1,220.79 = 491.63/x
  3. Step 3: Cross multiply
    884.60x = 1,220.79 × 491.63
  4. Step 4: Simplify right side
    884.60x = 600,172.73
  5. Step 5: Solve for x
    x = 600,172.73/884.60
  6. Step 6: Final answer
    x = 678.47

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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.