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Finding the Fourth Proportional to 979.20, 1,465.20 and 655.20

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Solution

The fourth proportional to 979.20, 1,465.20 and 655.20 is: 980.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.20 : 1,465.20 = 655.20 : x
  2. Step 2: Convert to fraction form
    979.20/1,465.20 = 655.20/x
  3. Step 3: Cross multiply
    979.20x = 1,465.20 × 655.20
  4. Step 4: Simplify right side
    979.20x = 959,999.04
  5. Step 5: Solve for x
    x = 959,999.04/979.20
  6. Step 6: Final answer
    x = 980.39

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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.