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Finding the Fourth Proportional to 15,628.80, 21,712.80 and 15,484.80

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Solution

The fourth proportional to 15,628.80, 21,712.80 and 15,484.80 is: 21,512.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,628.80 : 21,712.80 = 15,484.80 : x
  2. Step 2: Convert to fraction form
    15,628.80/21,712.80 = 15,484.80/x
  3. Step 3: Cross multiply
    15,628.80x = 21,712.80 × 15,484.80
  4. Step 4: Simplify right side
    15,628.80x = 336,218,365.44
  5. Step 5: Solve for x
    x = 336,218,365.44/15,628.80
  6. Step 6: Final answer
    x = 21,512.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.