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Finding the Fourth Proportional to 28,505.71, 39,328.28 and 18,446.87

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Solution

The fourth proportional to 28,505.71, 39,328.28 and 18,446.87 is: 25,450.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,505.71 : 39,328.28 = 18,446.87 : x
  2. Step 2: Convert to fraction form
    28,505.71/39,328.28 = 18,446.87/x
  3. Step 3: Cross multiply
    28,505.71x = 39,328.28 × 18,446.87
  4. Step 4: Simplify right side
    28,505.71x = 725,483,847.51
  5. Step 5: Solve for x
    x = 725,483,847.51/28,505.71
  6. Step 6: Final answer
    x = 25,450.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.