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Finding the Fourth Proportional to 979.12, 1,468.84 and 485.55

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Solution

The fourth proportional to 979.12, 1,468.84 and 485.55 is: 728.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.12 : 1,468.84 = 485.55 : x
  2. Step 2: Convert to fraction form
    979.12/1,468.84 = 485.55/x
  3. Step 3: Cross multiply
    979.12x = 1,468.84 × 485.55
  4. Step 4: Simplify right side
    979.12x = 713,185.49
  5. Step 5: Solve for x
    x = 713,185.49/979.12
  6. Step 6: Final answer
    x = 728.40

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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.