Home / 100,781.40-139,075.39-55,459.37

Finding the Fourth Proportional to 100,781.40, 139,075.39 and 55,459.37

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Solution

The fourth proportional to 100,781.40, 139,075.39 and 55,459.37 is: 76,532.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,781.40 : 139,075.39 = 55,459.37 : x
  2. Step 2: Convert to fraction form
    100,781.40/139,075.39 = 55,459.37/x
  3. Step 3: Cross multiply
    100,781.40x = 139,075.39 × 55,459.37
  4. Step 4: Simplify right side
    100,781.40x = 7,713,032,677.88
  5. Step 5: Solve for x
    x = 7,713,032,677.88/100,781.40
  6. Step 6: Final answer
    x = 76,532.30

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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.