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Finding the Fourth Proportional to 18,925.68, 28,388.42 and 10,605.72

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Solution

The fourth proportional to 18,925.68, 28,388.42 and 10,605.72 is: 15,908.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,925.68 : 28,388.42 = 10,605.72 : x
  2. Step 2: Convert to fraction form
    18,925.68/28,388.42 = 10,605.72/x
  3. Step 3: Cross multiply
    18,925.68x = 28,388.42 × 10,605.72
  4. Step 4: Simplify right side
    18,925.68x = 301,079,633.76
  5. Step 5: Solve for x
    x = 301,079,633.76/18,925.68
  6. Step 6: Final answer
    x = 15,908.52

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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.