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Finding the Fourth Proportional to 104,039.40, 155,840.40 and 86,543.40

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Solution

The fourth proportional to 104,039.40, 155,840.40 and 86,543.40 is: 129,633.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,039.40 : 155,840.40 = 86,543.40 : x
  2. Step 2: Convert to fraction form
    104,039.40/155,840.40 = 86,543.40/x
  3. Step 3: Cross multiply
    104,039.40x = 155,840.40 × 86,543.40
  4. Step 4: Simplify right side
    104,039.40x = 13,486,958,073.36
  5. Step 5: Solve for x
    x = 13,486,958,073.36/104,039.40
  6. Step 6: Final answer
    x = 129,633.18

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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.