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Finding the Fourth Proportional to 138,567.84, 191,224.44 and 78,139.68

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Solution

The fourth proportional to 138,567.84, 191,224.44 and 78,139.68 is: 107,833.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,567.84 : 191,224.44 = 78,139.68 : x
  2. Step 2: Convert to fraction form
    138,567.84/191,224.44 = 78,139.68/x
  3. Step 3: Cross multiply
    138,567.84x = 191,224.44 × 78,139.68
  4. Step 4: Simplify right side
    138,567.84x = 14,942,216,549.78
  5. Step 5: Solve for x
    x = 14,942,216,549.78/138,567.84
  6. Step 6: Final answer
    x = 107,833.22

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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.