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Finding the Fourth Proportional to 932.40, 1,395.90 and 905.40

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Solution

The fourth proportional to 932.40, 1,395.90 and 905.40 is: 1,355.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.40 : 1,395.90 = 905.40 : x
  2. Step 2: Convert to fraction form
    932.40/1,395.90 = 905.40/x
  3. Step 3: Cross multiply
    932.40x = 1,395.90 × 905.40
  4. Step 4: Simplify right side
    932.40x = 1,263,847.86
  5. Step 5: Solve for x
    x = 1,263,847.86/932.40
  6. Step 6: Final answer
    x = 1,355.48

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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.