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Finding the Fourth Proportional to 789.52, 1,089.72 and 509.68

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Solution

The fourth proportional to 789.52, 1,089.72 and 509.68 is: 703.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.52 : 1,089.72 = 509.68 : x
  2. Step 2: Convert to fraction form
    789.52/1,089.72 = 509.68/x
  3. Step 3: Cross multiply
    789.52x = 1,089.72 × 509.68
  4. Step 4: Simplify right side
    789.52x = 555,408.49
  5. Step 5: Solve for x
    x = 555,408.49/789.52
  6. Step 6: Final answer
    x = 703.48

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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.