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Finding the Fourth Proportional to 28,539.12, 42,808.68 and 7,764.24

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Solution

The fourth proportional to 28,539.12, 42,808.68 and 7,764.24 is: 11,646.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,539.12 : 42,808.68 = 7,764.24 : x
  2. Step 2: Convert to fraction form
    28,539.12/42,808.68 = 7,764.24/x
  3. Step 3: Cross multiply
    28,539.12x = 42,808.68 × 7,764.24
  4. Step 4: Simplify right side
    28,539.12x = 332,376,865.60
  5. Step 5: Solve for x
    x = 332,376,865.60/28,539.12
  6. Step 6: Final answer
    x = 11,646.36

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1.5x scale

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.