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Finding the Fourth Proportional to 884.55, 1,220.72 and 491.70

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Solution

The fourth proportional to 884.55, 1,220.72 and 491.70 is: 678.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.55 : 1,220.72 = 491.70 : x
  2. Step 2: Convert to fraction form
    884.55/1,220.72 = 491.70/x
  3. Step 3: Cross multiply
    884.55x = 1,220.72 × 491.70
  4. Step 4: Simplify right side
    884.55x = 600,228.02
  5. Step 5: Solve for x
    x = 600,228.02/884.55
  6. Step 6: Final answer
    x = 678.57

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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.