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Finding the Fourth Proportional to 789.48, 1,089.36 and 509.76

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Solution

The fourth proportional to 789.48, 1,089.36 and 509.76 is: 703.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.48 : 1,089.36 = 509.76 : x
  2. Step 2: Convert to fraction form
    789.48/1,089.36 = 509.76/x
  3. Step 3: Cross multiply
    789.48x = 1,089.36 × 509.76
  4. Step 4: Simplify right side
    789.48x = 555,312.15
  5. Step 5: Solve for x
    x = 555,312.15/789.48
  6. Step 6: Final answer
    x = 703.39

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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.