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Finding the Fourth Proportional to 258,903.57, 388,372.11 and 81,417.45

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Solution

The fourth proportional to 258,903.57, 388,372.11 and 81,417.45 is: 122,131.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,903.57 : 388,372.11 = 81,417.45 : x
  2. Step 2: Convert to fraction form
    258,903.57/388,372.11 = 81,417.45/x
  3. Step 3: Cross multiply
    258,903.57x = 388,372.11 × 81,417.45
  4. Step 4: Simplify right side
    258,903.57x = 31,620,266,847.32
  5. Step 5: Solve for x
    x = 31,620,266,847.32/258,903.57
  6. Step 6: Final answer
    x = 122,131.44

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1.5x scale

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.