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Finding the Fourth Proportional to 28,128, 38,813.28 and 15,551.04

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Solution

The fourth proportional to 28,128, 38,813.28 and 15,551.04 is: 21,458.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,128 : 38,813.28 = 15,551.04 : x
  2. Step 2: Convert to fraction form
    28,128/38,813.28 = 15,551.04/x
  3. Step 3: Cross multiply
    28,128x = 38,813.28 × 15,551.04
  4. Step 4: Simplify right side
    28,128x = 603,586,869.81
  5. Step 5: Solve for x
    x = 603,586,869.81/28,128
  6. Step 6: Final answer
    x = 21,458.58

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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.