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Finding the Fourth Proportional to 869.61, 1,199.76 and 533.68

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Solution

The fourth proportional to 869.61, 1,199.76 and 533.68 is: 736.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.61 : 1,199.76 = 533.68 : x
  2. Step 2: Convert to fraction form
    869.61/1,199.76 = 533.68/x
  3. Step 3: Cross multiply
    869.61x = 1,199.76 × 533.68
  4. Step 4: Simplify right side
    869.61x = 640,287.92
  5. Step 5: Solve for x
    x = 640,287.92/869.61
  6. Step 6: Final answer
    x = 736.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.