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Finding the Fourth Proportional to 12,615.88, 17,409.54 and 7,239.22

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Solution

The fourth proportional to 12,615.88, 17,409.54 and 7,239.22 is: 9,989.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,615.88 : 17,409.54 = 7,239.22 : x
  2. Step 2: Convert to fraction form
    12,615.88/17,409.54 = 7,239.22/x
  3. Step 3: Cross multiply
    12,615.88x = 17,409.54 × 7,239.22
  4. Step 4: Simplify right side
    12,615.88x = 126,031,490.16
  5. Step 5: Solve for x
    x = 126,031,490.16/12,615.88
  6. Step 6: Final answer
    x = 9,989.91

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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.