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Finding the Fourth Proportional to 28,391.84, 39,176.88 and 15,814.88

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Solution

The fourth proportional to 28,391.84, 39,176.88 and 15,814.88 is: 21,822.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,391.84 : 39,176.88 = 15,814.88 : x
  2. Step 2: Convert to fraction form
    28,391.84/39,176.88 = 15,814.88/x
  3. Step 3: Cross multiply
    28,391.84x = 39,176.88 × 15,814.88
  4. Step 4: Simplify right side
    28,391.84x = 619,577,655.97
  5. Step 5: Solve for x
    x = 619,577,655.97/28,391.84
  6. Step 6: Final answer
    x = 21,822.38

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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.