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Finding the Fourth Proportional to 138,887.84, 191,661.62 and 78,464.72

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Solution

The fourth proportional to 138,887.84, 191,661.62 and 78,464.72 is: 108,279.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,887.84 : 191,661.62 = 78,464.72 : x
  2. Step 2: Convert to fraction form
    138,887.84/191,661.62 = 78,464.72/x
  3. Step 3: Cross multiply
    138,887.84x = 191,661.62 × 78,464.72
  4. Step 4: Simplify right side
    138,887.84x = 15,038,675,348.05
  5. Step 5: Solve for x
    x = 15,038,675,348.05/138,887.84
  6. Step 6: Final answer
    x = 108,279.28

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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.