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Finding the Fourth Proportional to 842.02, 1,263.93 and 638.81

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Solution

The fourth proportional to 842.02, 1,263.93 and 638.81 is: 958.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.02 : 1,263.93 = 638.81 : x
  2. Step 2: Convert to fraction form
    842.02/1,263.93 = 638.81/x
  3. Step 3: Cross multiply
    842.02x = 1,263.93 × 638.81
  4. Step 4: Simplify right side
    842.02x = 807,411.12
  5. Step 5: Solve for x
    x = 807,411.12/842.02
  6. Step 6: Final answer
    x = 958.90

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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.