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Finding the Fourth Proportional to 982.40, 1,355.76 and 589.40

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Solution

The fourth proportional to 982.40, 1,355.76 and 589.40 is: 813.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.40 : 1,355.76 = 589.40 : x
  2. Step 2: Convert to fraction form
    982.40/1,355.76 = 589.40/x
  3. Step 3: Cross multiply
    982.40x = 1,355.76 × 589.40
  4. Step 4: Simplify right side
    982.40x = 799,084.94
  5. Step 5: Solve for x
    x = 799,084.94/982.40
  6. Step 6: Final answer
    x = 813.40

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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.