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Finding the Fourth Proportional to 138,615.70, 191,289.53 and 74,953.35

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Solution

The fourth proportional to 138,615.70, 191,289.53 and 74,953.35 is: 103,435.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,615.70 : 191,289.53 = 74,953.35 : x
  2. Step 2: Convert to fraction form
    138,615.70/191,289.53 = 74,953.35/x
  3. Step 3: Cross multiply
    138,615.70x = 191,289.53 × 74,953.35
  4. Step 4: Simplify right side
    138,615.70x = 14,337,790,136.98
  5. Step 5: Solve for x
    x = 14,337,790,136.98/138,615.70
  6. Step 6: Final answer
    x = 103,435.54

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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.