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Finding the Fourth Proportional to 884.38, 1,220.40 and 491.40

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Solution

The fourth proportional to 884.38, 1,220.40 and 491.40 is: 678.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.38 : 1,220.40 = 491.40 : x
  2. Step 2: Convert to fraction form
    884.38/1,220.40 = 491.40/x
  3. Step 3: Cross multiply
    884.38x = 1,220.40 × 491.40
  4. Step 4: Simplify right side
    884.38x = 599,698.46
  5. Step 5: Solve for x
    x = 599,698.46/884.38
  6. Step 6: Final answer
    x = 678.10

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.