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Finding the Fourth Proportional to 12,885.84, 17,781.41 and 7,219.76

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Solution

The fourth proportional to 12,885.84, 17,781.41 and 7,219.76 is: 9,962.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,885.84 : 17,781.41 = 7,219.76 : x
  2. Step 2: Convert to fraction form
    12,885.84/17,781.41 = 7,219.76/x
  3. Step 3: Cross multiply
    12,885.84x = 17,781.41 × 7,219.76
  4. Step 4: Simplify right side
    12,885.84x = 128,377,387.66
  5. Step 5: Solve for x
    x = 128,377,387.66/12,885.84
  6. Step 6: Final answer
    x = 9,962.67

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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.