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Finding the Fourth Proportional to 15,878.70, 21,915.50 and 9,163.40

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Solution

The fourth proportional to 15,878.70, 21,915.50 and 9,163.40 is: 12,647.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,878.70 : 21,915.50 = 9,163.40 : x
  2. Step 2: Convert to fraction form
    15,878.70/21,915.50 = 9,163.40/x
  3. Step 3: Cross multiply
    15,878.70x = 21,915.50 × 9,163.40
  4. Step 4: Simplify right side
    15,878.70x = 200,820,337.31
  5. Step 5: Solve for x
    x = 200,820,337.31/15,878.70
  6. Step 6: Final answer
    x = 12,647.15

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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.