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Finding the Fourth Proportional to 985.98, 1,479.84 and 574.55

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Solution

The fourth proportional to 985.98, 1,479.84 and 574.55 is: 862.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.98 : 1,479.84 = 574.55 : x
  2. Step 2: Convert to fraction form
    985.98/1,479.84 = 574.55/x
  3. Step 3: Cross multiply
    985.98x = 1,479.84 × 574.55
  4. Step 4: Simplify right side
    985.98x = 850,242.07
  5. Step 5: Solve for x
    x = 850,242.07/985.98
  6. Step 6: Final answer
    x = 862.33

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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.