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Finding the Fourth Proportional to 589.76, 813.60 and 393.36

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Solution

The fourth proportional to 589.76, 813.60 and 393.36 is: 542.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.76 : 813.60 = 393.36 : x
  2. Step 2: Convert to fraction form
    589.76/813.60 = 393.36/x
  3. Step 3: Cross multiply
    589.76x = 813.60 × 393.36
  4. Step 4: Simplify right side
    589.76x = 320,037.70
  5. Step 5: Solve for x
    x = 320,037.70/589.76
  6. Step 6: Final answer
    x = 542.66

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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.