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Finding the Fourth Proportional to 768.75, 1,151.55 and 603.90

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Solution

The fourth proportional to 768.75, 1,151.55 and 603.90 is: 904.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.75 : 1,151.55 = 603.90 : x
  2. Step 2: Convert to fraction form
    768.75/1,151.55 = 603.90/x
  3. Step 3: Cross multiply
    768.75x = 1,151.55 × 603.90
  4. Step 4: Simplify right side
    768.75x = 695,421.05
  5. Step 5: Solve for x
    x = 695,421.05/768.75
  6. Step 6: Final answer
    x = 904.61

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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.