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Finding the Fourth Proportional to 138,859.52, 191,624.64 and 78,430.28

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Solution

The fourth proportional to 138,859.52, 191,624.64 and 78,430.28 is: 108,232.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,859.52 : 191,624.64 = 78,430.28 : x
  2. Step 2: Convert to fraction form
    138,859.52/191,624.64 = 78,430.28/x
  3. Step 3: Cross multiply
    138,859.52x = 191,624.64 × 78,430.28
  4. Step 4: Simplify right side
    138,859.52x = 15,029,174,170.10
  5. Step 5: Solve for x
    x = 15,029,174,170.10/138,859.52
  6. Step 6: Final answer
    x = 108,232.94

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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.