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Finding the Fourth Proportional to 753.60, 1,039.92 and 459.12

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Solution

The fourth proportional to 753.60, 1,039.92 and 459.12 is: 633.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.60 : 1,039.92 = 459.12 : x
  2. Step 2: Convert to fraction form
    753.60/1,039.92 = 459.12/x
  3. Step 3: Cross multiply
    753.60x = 1,039.92 × 459.12
  4. Step 4: Simplify right side
    753.60x = 477,448.07
  5. Step 5: Solve for x
    x = 477,448.07/753.60
  6. Step 6: Final answer
    x = 633.56

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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.