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Finding the Fourth Proportional to 883.69, 1,219.56 and 490.78

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Solution

The fourth proportional to 883.69, 1,219.56 and 490.78 is: 677.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.69 : 1,219.56 = 490.78 : x
  2. Step 2: Convert to fraction form
    883.69/1,219.56 = 490.78/x
  3. Step 3: Cross multiply
    883.69x = 1,219.56 × 490.78
  4. Step 4: Simplify right side
    883.69x = 598,535.66
  5. Step 5: Solve for x
    x = 598,535.66/883.69
  6. Step 6: Final answer
    x = 677.31

Related Problems

Find fourth proportional to 441.85, 609.78 and 245.39
Half scale
Find fourth proportional to 1,767.38, 2,439.12 and 981.56
Double scale
Find fourth proportional to 884.69, 1,220.94 and 491.78
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.