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Finding the Fourth Proportional to 28,536.65, 42,815.07 and 12,740.21

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Solution

The fourth proportional to 28,536.65, 42,815.07 and 12,740.21 is: 19,114.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,536.65 : 42,815.07 = 12,740.21 : x
  2. Step 2: Convert to fraction form
    28,536.65/42,815.07 = 12,740.21/x
  3. Step 3: Cross multiply
    28,536.65x = 42,815.07 × 12,740.21
  4. Step 4: Simplify right side
    28,536.65x = 545,472,982.96
  5. Step 5: Solve for x
    x = 545,472,982.96/28,536.65
  6. Step 6: Final answer
    x = 19,114.82

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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.