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Finding the Fourth Proportional to 28,518.65, 42,786.17 and 14,478.11

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Solution

The fourth proportional to 28,518.65, 42,786.17 and 14,478.11 is: 21,721.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,518.65 : 42,786.17 = 14,478.11 : x
  2. Step 2: Convert to fraction form
    28,518.65/42,786.17 = 14,478.11/x
  3. Step 3: Cross multiply
    28,518.65x = 42,786.17 × 14,478.11
  4. Step 4: Simplify right side
    28,518.65x = 619,462,589.42
  5. Step 5: Solve for x
    x = 619,462,589.42/28,518.65
  6. Step 6: Final answer
    x = 21,721.32

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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.