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Finding the Fourth Proportional to 884.65, 1,220.88 and 491.70

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Solution

The fourth proportional to 884.65, 1,220.88 and 491.70 is: 678.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.65 : 1,220.88 = 491.70 : x
  2. Step 2: Convert to fraction form
    884.65/1,220.88 = 491.70/x
  3. Step 3: Cross multiply
    884.65x = 1,220.88 × 491.70
  4. Step 4: Simplify right side
    884.65x = 600,300.27
  5. Step 5: Solve for x
    x = 600,300.27/884.65
  6. Step 6: Final answer
    x = 678.58

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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.