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Finding the Fourth Proportional to 12,885.40, 17,781.78 and 7,296.04

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Solution

The fourth proportional to 12,885.40, 17,781.78 and 7,296.04 is: 10,068.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,885.40 : 17,781.78 = 7,296.04 : x
  2. Step 2: Convert to fraction form
    12,885.40/17,781.78 = 7,296.04/x
  3. Step 3: Cross multiply
    12,885.40x = 17,781.78 × 7,296.04
  4. Step 4: Simplify right side
    12,885.40x = 129,736,578.15
  5. Step 5: Solve for x
    x = 129,736,578.15/12,885.40
  6. Step 6: Final answer
    x = 10,068.49

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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.