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Finding the Fourth Proportional to 15,008.78, 20,712.06 and 8,384.78

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Solution

The fourth proportional to 15,008.78, 20,712.06 and 8,384.78 is: 11,570.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,008.78 : 20,712.06 = 8,384.78 : x
  2. Step 2: Convert to fraction form
    15,008.78/20,712.06 = 8,384.78/x
  3. Step 3: Cross multiply
    15,008.78x = 20,712.06 × 8,384.78
  4. Step 4: Simplify right side
    15,008.78x = 173,666,066.45
  5. Step 5: Solve for x
    x = 173,666,066.45/15,008.78
  6. Step 6: Final answer
    x = 11,570.96

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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.