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Finding the Fourth Proportional to 12,878.31, 17,772.96 and 7,213.51

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Solution

The fourth proportional to 12,878.31, 17,772.96 and 7,213.51 is: 9,955.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,878.31 : 17,772.96 = 7,213.51 : x
  2. Step 2: Convert to fraction form
    12,878.31/17,772.96 = 7,213.51/x
  3. Step 3: Cross multiply
    12,878.31x = 17,772.96 × 7,213.51
  4. Step 4: Simplify right side
    12,878.31x = 128,205,424.69
  5. Step 5: Solve for x
    x = 128,205,424.69/12,878.31
  6. Step 6: Final answer
    x = 9,955.14

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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.