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Finding the Fourth Proportional to 15,431.80, 21,578.60 and 15,431.80

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Solution

The fourth proportional to 15,431.80, 21,578.60 and 15,431.80 is: 21,578.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,431.80 : 21,578.60 = 15,431.80 : x
  2. Step 2: Convert to fraction form
    15,431.80/21,578.60 = 15,431.80/x
  3. Step 3: Cross multiply
    15,431.80x = 21,578.60 × 15,431.80
  4. Step 4: Simplify right side
    15,431.80x = 332,996,639.48
  5. Step 5: Solve for x
    x = 332,996,639.48/15,431.80
  6. Step 6: Final answer
    x = 21,578.60

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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.