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Finding the Fourth Proportional to 842.42, 1,262.72 and 322.08

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Solution

The fourth proportional to 842.42, 1,262.72 and 322.08 is: 482.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.42 : 1,262.72 = 322.08 : x
  2. Step 2: Convert to fraction form
    842.42/1,262.72 = 322.08/x
  3. Step 3: Cross multiply
    842.42x = 1,262.72 × 322.08
  4. Step 4: Simplify right side
    842.42x = 406,695.25
  5. Step 5: Solve for x
    x = 406,695.25/842.42
  6. Step 6: Final answer
    x = 482.77

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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.