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Finding the Fourth Proportional to 881.02, 1,320.60 and 638.68

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Solution

The fourth proportional to 881.02, 1,320.60 and 638.68 is: 957.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.02 : 1,320.60 = 638.68 : x
  2. Step 2: Convert to fraction form
    881.02/1,320.60 = 638.68/x
  3. Step 3: Cross multiply
    881.02x = 1,320.60 × 638.68
  4. Step 4: Simplify right side
    881.02x = 843,440.81
  5. Step 5: Solve for x
    x = 843,440.81/881.02
  6. Step 6: Final answer
    x = 957.35

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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.