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Finding the Fourth Proportional to 15,204.78, 20,981.16 and 8,915.94

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Solution

The fourth proportional to 15,204.78, 20,981.16 and 8,915.94 is: 12,303.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,204.78 : 20,981.16 = 8,915.94 : x
  2. Step 2: Convert to fraction form
    15,204.78/20,981.16 = 8,915.94/x
  3. Step 3: Cross multiply
    15,204.78x = 20,981.16 × 8,915.94
  4. Step 4: Simplify right side
    15,204.78x = 187,066,763.69
  5. Step 5: Solve for x
    x = 187,066,763.69/15,204.78
  6. Step 6: Final answer
    x = 12,303.15

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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.