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Finding the Fourth Proportional to 984.48, 1,358.55 and 611.34

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Solution

The fourth proportional to 984.48, 1,358.55 and 611.34 is: 843.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.48 : 1,358.55 = 611.34 : x
  2. Step 2: Convert to fraction form
    984.48/1,358.55 = 611.34/x
  3. Step 3: Cross multiply
    984.48x = 1,358.55 × 611.34
  4. Step 4: Simplify right side
    984.48x = 830,535.96
  5. Step 5: Solve for x
    x = 830,535.96/984.48
  6. Step 6: Final answer
    x = 843.63

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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.