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Finding the Fourth Proportional to 258,216.72, 356,339.28 and 145,039.56

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Solution

The fourth proportional to 258,216.72, 356,339.28 and 145,039.56 is: 200,154.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,216.72 : 356,339.28 = 145,039.56 : x
  2. Step 2: Convert to fraction form
    258,216.72/356,339.28 = 145,039.56/x
  3. Step 3: Cross multiply
    258,216.72x = 356,339.28 × 145,039.56
  4. Step 4: Simplify right side
    258,216.72x = 51,683,292,381.92
  5. Step 5: Solve for x
    x = 51,683,292,381.92/258,216.72
  6. Step 6: Final answer
    x = 200,154.71

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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.