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Finding the Fourth Proportional to 842.81, 1,263.60 and 431.63

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Solution

The fourth proportional to 842.81, 1,263.60 and 431.63 is: 647.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.81 : 1,263.60 = 431.63 : x
  2. Step 2: Convert to fraction form
    842.81/1,263.60 = 431.63/x
  3. Step 3: Cross multiply
    842.81x = 1,263.60 × 431.63
  4. Step 4: Simplify right side
    842.81x = 545,406.09
  5. Step 5: Solve for x
    x = 545,406.09/842.81
  6. Step 6: Final answer
    x = 647.13

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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.