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Finding the Fourth Proportional to 982.40, 1,470.90 and 955.40

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Solution

The fourth proportional to 982.40, 1,470.90 and 955.40 is: 1,430.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.40 : 1,470.90 = 955.40 : x
  2. Step 2: Convert to fraction form
    982.40/1,470.90 = 955.40/x
  3. Step 3: Cross multiply
    982.40x = 1,470.90 × 955.40
  4. Step 4: Simplify right side
    982.40x = 1,405,297.86
  5. Step 5: Solve for x
    x = 1,405,297.86/982.40
  6. Step 6: Final answer
    x = 1,430.47

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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.