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Finding the Fourth Proportional to 883.14, 1,324.40 and 420.54

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Solution

The fourth proportional to 883.14, 1,324.40 and 420.54 is: 630.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.14 : 1,324.40 = 420.54 : x
  2. Step 2: Convert to fraction form
    883.14/1,324.40 = 420.54/x
  3. Step 3: Cross multiply
    883.14x = 1,324.40 × 420.54
  4. Step 4: Simplify right side
    883.14x = 556,961.07
  5. Step 5: Solve for x
    x = 556,961.07/883.14
  6. Step 6: Final answer
    x = 630.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.