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Finding the Fourth Proportional to 15,427.80, 21,573 and 15,427.80

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Solution

The fourth proportional to 15,427.80, 21,573 and 15,427.80 is: 21,573

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,427.80 : 21,573 = 15,427.80 : x
  2. Step 2: Convert to fraction form
    15,427.80/21,573 = 15,427.80/x
  3. Step 3: Cross multiply
    15,427.80x = 21,573 × 15,427.80
  4. Step 4: Simplify right side
    15,427.80x = 332,823,929.40
  5. Step 5: Solve for x
    x = 332,823,929.40/15,427.80
  6. Step 6: Final answer
    x = 21,573

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.