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Finding the Fourth Proportional to 842.26, 1,262.40 and 477.40

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Solution

The fourth proportional to 842.26, 1,262.40 and 477.40 is: 715.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.26 : 1,262.40 = 477.40 : x
  2. Step 2: Convert to fraction form
    842.26/1,262.40 = 477.40/x
  3. Step 3: Cross multiply
    842.26x = 1,262.40 × 477.40
  4. Step 4: Simplify right side
    842.26x = 602,669.76
  5. Step 5: Solve for x
    x = 602,669.76/842.26
  6. Step 6: Final answer
    x = 715.54

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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.