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Finding the Fourth Proportional to 28,987.80, 43,532.90 and 21,205.40

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Solution

The fourth proportional to 28,987.80, 43,532.90 and 21,205.40 is: 31,845.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,987.80 : 43,532.90 = 21,205.40 : x
  2. Step 2: Convert to fraction form
    28,987.80/43,532.90 = 21,205.40/x
  3. Step 3: Cross multiply
    28,987.80x = 43,532.90 × 21,205.40
  4. Step 4: Simplify right side
    28,987.80x = 923,132,557.66
  5. Step 5: Solve for x
    x = 923,132,557.66/28,987.80
  6. Step 6: Final answer
    x = 31,845.55

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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.