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Finding the Fourth Proportional to 81,140.59, 111,973.21 and 45,330.49

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Solution

The fourth proportional to 81,140.59, 111,973.21 and 45,330.49 is: 62,555.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,140.59 : 111,973.21 = 45,330.49 : x
  2. Step 2: Convert to fraction form
    81,140.59/111,973.21 = 45,330.49/x
  3. Step 3: Cross multiply
    81,140.59x = 111,973.21 × 45,330.49
  4. Step 4: Simplify right side
    81,140.59x = 5,075,800,476.17
  5. Step 5: Solve for x
    x = 5,075,800,476.17/81,140.59
  6. Step 6: Final answer
    x = 62,555.63

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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.