Home / 149,123.01-205,790.61-81,140.45

Finding the Fourth Proportional to 149,123.01, 205,790.61 and 81,140.45

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Solution

The fourth proportional to 149,123.01, 205,790.61 and 81,140.45 is: 111,974.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,123.01 : 205,790.61 = 81,140.45 : x
  2. Step 2: Convert to fraction form
    149,123.01/205,790.61 = 81,140.45/x
  3. Step 3: Cross multiply
    149,123.01x = 205,790.61 × 81,140.45
  4. Step 4: Simplify right side
    149,123.01x = 16,697,941,672.22
  5. Step 5: Solve for x
    x = 16,697,941,672.22/149,123.01
  6. Step 6: Final answer
    x = 111,974.28

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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.