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Finding the Fourth Proportional to 842.34, 1,262.98 and 403.57

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Solution

The fourth proportional to 842.34, 1,262.98 and 403.57 is: 605.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.34 : 1,262.98 = 403.57 : x
  2. Step 2: Convert to fraction form
    842.34/1,262.98 = 403.57/x
  3. Step 3: Cross multiply
    842.34x = 1,262.98 × 403.57
  4. Step 4: Simplify right side
    842.34x = 509,700.84
  5. Step 5: Solve for x
    x = 509,700.84/842.34
  6. Step 6: Final answer
    x = 605.10

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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.