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Finding the Fourth Proportional to 28,146.78, 38,842.50 and 15,571.50

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Solution

The fourth proportional to 28,146.78, 38,842.50 and 15,571.50 is: 21,488.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,146.78 : 38,842.50 = 15,571.50 : x
  2. Step 2: Convert to fraction form
    28,146.78/38,842.50 = 15,571.50/x
  3. Step 3: Cross multiply
    28,146.78x = 38,842.50 × 15,571.50
  4. Step 4: Simplify right side
    28,146.78x = 604,835,988.75
  5. Step 5: Solve for x
    x = 604,835,988.75/28,146.78
  6. Step 6: Final answer
    x = 21,488.64

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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.