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Finding the Fourth Proportional to 28,539.90, 42,813.90 and 8,820.18

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Solution

The fourth proportional to 28,539.90, 42,813.90 and 8,820.18 is: 13,231.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,539.90 : 42,813.90 = 8,820.18 : x
  2. Step 2: Convert to fraction form
    28,539.90/42,813.90 = 8,820.18/x
  3. Step 3: Cross multiply
    28,539.90x = 42,813.90 × 8,820.18
  4. Step 4: Simplify right side
    28,539.90x = 377,626,304.50
  5. Step 5: Solve for x
    x = 377,626,304.50/28,539.90
  6. Step 6: Final answer
    x = 13,231.52

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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.