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Finding the Fourth Proportional to 45,642.38, 68,472.20 and 21,018.38

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Solution

The fourth proportional to 45,642.38, 68,472.20 and 21,018.38 is: 31,531.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,642.38 : 68,472.20 = 21,018.38 : x
  2. Step 2: Convert to fraction form
    45,642.38/68,472.20 = 21,018.38/x
  3. Step 3: Cross multiply
    45,642.38x = 68,472.20 × 21,018.38
  4. Step 4: Simplify right side
    45,642.38x = 1,439,174,429.22
  5. Step 5: Solve for x
    x = 1,439,174,429.22/45,642.38
  6. Step 6: Final answer
    x = 31,531.54

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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.