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Finding the Fourth Proportional to 955.40, 1,430.94 and 739.40

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Solution

The fourth proportional to 955.40, 1,430.94 and 739.40 is: 1,107.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.40 : 1,430.94 = 739.40 : x
  2. Step 2: Convert to fraction form
    955.40/1,430.94 = 739.40/x
  3. Step 3: Cross multiply
    955.40x = 1,430.94 × 739.40
  4. Step 4: Simplify right side
    955.40x = 1,058,037.04
  5. Step 5: Solve for x
    x = 1,058,037.04/955.40
  6. Step 6: Final answer
    x = 1,107.43

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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.