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Finding the Fourth Proportional to 904.38, 1,355.64 and 513.55

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Solution

The fourth proportional to 904.38, 1,355.64 and 513.55 is: 769.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.38 : 1,355.64 = 513.55 : x
  2. Step 2: Convert to fraction form
    904.38/1,355.64 = 513.55/x
  3. Step 3: Cross multiply
    904.38x = 1,355.64 × 513.55
  4. Step 4: Simplify right side
    904.38x = 696,188.92
  5. Step 5: Solve for x
    x = 696,188.92/904.38
  6. Step 6: Final answer
    x = 769.80

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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.