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Finding the Fourth Proportional to 884.40, 1,219.78 and 618.76

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Solution

The fourth proportional to 884.40, 1,219.78 and 618.76 is: 853.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.40 : 1,219.78 = 618.76 : x
  2. Step 2: Convert to fraction form
    884.40/1,219.78 = 618.76/x
  3. Step 3: Cross multiply
    884.40x = 1,219.78 × 618.76
  4. Step 4: Simplify right side
    884.40x = 754,751.07
  5. Step 5: Solve for x
    x = 754,751.07/884.40
  6. Step 6: Final answer
    x = 853.40

Related Problems

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Half scale
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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.