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Finding the Fourth Proportional to 8,726.40, 13,090.40 and 3,531.20

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Solution

The fourth proportional to 8,726.40, 13,090.40 and 3,531.20 is: 5,297.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,726.40 : 13,090.40 = 3,531.20 : x
  2. Step 2: Convert to fraction form
    8,726.40/13,090.40 = 3,531.20/x
  3. Step 3: Cross multiply
    8,726.40x = 13,090.40 × 3,531.20
  4. Step 4: Simplify right side
    8,726.40x = 46,224,820.48
  5. Step 5: Solve for x
    x = 46,224,820.48/8,726.40
  6. Step 6: Final answer
    x = 5,297.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.