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Finding the Fourth Proportional to 12,885.51, 17,783.43 and 7,221.18

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Solution

The fourth proportional to 12,885.51, 17,783.43 and 7,221.18 is: 9,966.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,885.51 : 17,783.43 = 7,221.18 : x
  2. Step 2: Convert to fraction form
    12,885.51/17,783.43 = 7,221.18/x
  3. Step 3: Cross multiply
    12,885.51x = 17,783.43 × 7,221.18
  4. Step 4: Simplify right side
    12,885.51x = 128,417,349.05
  5. Step 5: Solve for x
    x = 128,417,349.05/12,885.51
  6. Step 6: Final answer
    x = 9,966.03

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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.