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Finding the Fourth Proportional to 28,391, 39,179.58 and 15,816.56

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Solution

The fourth proportional to 28,391, 39,179.58 and 15,816.56 is: 21,826.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,391 : 39,179.58 = 15,816.56 : x
  2. Step 2: Convert to fraction form
    28,391/39,179.58 = 15,816.56/x
  3. Step 3: Cross multiply
    28,391x = 39,179.58 × 15,816.56
  4. Step 4: Simplify right side
    28,391x = 619,686,177.84
  5. Step 5: Solve for x
    x = 619,686,177.84/28,391
  6. Step 6: Final answer
    x = 21,826.85

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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.