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Finding the Fourth Proportional to 12,810.24, 17,678.16 and 7,221.24

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Solution

The fourth proportional to 12,810.24, 17,678.16 and 7,221.24 is: 9,965.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,810.24 : 17,678.16 = 7,221.24 : x
  2. Step 2: Convert to fraction form
    12,810.24/17,678.16 = 7,221.24/x
  3. Step 3: Cross multiply
    12,810.24x = 17,678.16 × 7,221.24
  4. Step 4: Simplify right side
    12,810.24x = 127,658,236.12
  5. Step 5: Solve for x
    x = 127,658,236.12/12,810.24
  6. Step 6: Final answer
    x = 9,965.33

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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.