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Finding the Fourth Proportional to 983.32, 1,474.06 and 427.68

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Solution

The fourth proportional to 983.32, 1,474.06 and 427.68 is: 641.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.32 : 1,474.06 = 427.68 : x
  2. Step 2: Convert to fraction form
    983.32/1,474.06 = 427.68/x
  3. Step 3: Cross multiply
    983.32x = 1,474.06 × 427.68
  4. Step 4: Simplify right side
    983.32x = 630,425.98
  5. Step 5: Solve for x
    x = 630,425.98/983.32
  6. Step 6: Final answer
    x = 641.12

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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.