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Finding the Fourth Proportional to 28,637.80, 43,007.90 and 20,855.40

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Solution

The fourth proportional to 28,637.80, 43,007.90 and 20,855.40 is: 31,320.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,637.80 : 43,007.90 = 20,855.40 : x
  2. Step 2: Convert to fraction form
    28,637.80/43,007.90 = 20,855.40/x
  3. Step 3: Cross multiply
    28,637.80x = 43,007.90 × 20,855.40
  4. Step 4: Simplify right side
    28,637.80x = 896,946,957.66
  5. Step 5: Solve for x
    x = 896,946,957.66/28,637.80
  6. Step 6: Final answer
    x = 31,320.39

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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.