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Finding the Fourth Proportional to 984.60, 1,358.64 and 788.04

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Solution

The fourth proportional to 984.60, 1,358.64 and 788.04 is: 1,087.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.60 : 1,358.64 = 788.04 : x
  2. Step 2: Convert to fraction form
    984.60/1,358.64 = 788.04/x
  3. Step 3: Cross multiply
    984.60x = 1,358.64 × 788.04
  4. Step 4: Simplify right side
    984.60x = 1,070,662.67
  5. Step 5: Solve for x
    x = 1,070,662.67/984.60
  6. Step 6: Final answer
    x = 1,087.41

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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.