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Finding the Fourth Proportional to 12,726.88, 17,561.48 and 7,420.38

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Solution

The fourth proportional to 12,726.88, 17,561.48 and 7,420.38 is: 10,239.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,726.88 : 17,561.48 = 7,420.38 : x
  2. Step 2: Convert to fraction form
    12,726.88/17,561.48 = 7,420.38/x
  3. Step 3: Cross multiply
    12,726.88x = 17,561.48 × 7,420.38
  4. Step 4: Simplify right side
    12,726.88x = 130,312,854.96
  5. Step 5: Solve for x
    x = 130,312,854.96/12,726.88
  6. Step 6: Final answer
    x = 10,239.18

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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.