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Finding the Fourth Proportional to 12,921.48, 17,832.96 and 7,888.68

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Solution

The fourth proportional to 12,921.48, 17,832.96 and 7,888.68 is: 10,887.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,921.48 : 17,832.96 = 7,888.68 : x
  2. Step 2: Convert to fraction form
    12,921.48/17,832.96 = 7,888.68/x
  3. Step 3: Cross multiply
    12,921.48x = 17,832.96 × 7,888.68
  4. Step 4: Simplify right side
    12,921.48x = 140,678,514.89
  5. Step 5: Solve for x
    x = 140,678,514.89/12,921.48
  6. Step 6: Final answer
    x = 10,887.18

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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.