Home / 75,138.90-103,688.48-41,146.78

Finding the Fourth Proportional to 75,138.90, 103,688.48 and 41,146.78

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Solution

The fourth proportional to 75,138.90, 103,688.48 and 41,146.78 is: 56,780.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,138.90 : 103,688.48 = 41,146.78 : x
  2. Step 2: Convert to fraction form
    75,138.90/103,688.48 = 41,146.78/x
  3. Step 3: Cross multiply
    75,138.90x = 103,688.48 × 41,146.78
  4. Step 4: Simplify right side
    75,138.90x = 4,266,447,075.09
  5. Step 5: Solve for x
    x = 4,266,447,075.09/75,138.90
  6. Step 6: Final answer
    x = 56,780.80

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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.