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Finding the Fourth Proportional to 724.86, 1,087.43 and 465.12

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Solution

The fourth proportional to 724.86, 1,087.43 and 465.12 is: 697.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.86 : 1,087.43 = 465.12 : x
  2. Step 2: Convert to fraction form
    724.86/1,087.43 = 465.12/x
  3. Step 3: Cross multiply
    724.86x = 1,087.43 × 465.12
  4. Step 4: Simplify right side
    724.86x = 505,783.12
  5. Step 5: Solve for x
    x = 505,783.12/724.86
  6. Step 6: Final answer
    x = 697.77

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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.