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Finding the Fourth Proportional to 79,218, 109,320.84 and 45,684

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Solution

The fourth proportional to 79,218, 109,320.84 and 45,684 is: 63,043.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,218 : 109,320.84 = 45,684 : x
  2. Step 2: Convert to fraction form
    79,218/109,320.84 = 45,684/x
  3. Step 3: Cross multiply
    79,218x = 109,320.84 × 45,684
  4. Step 4: Simplify right side
    79,218x = 4,994,213,254.56
  5. Step 5: Solve for x
    x = 4,994,213,254.56/79,218
  6. Step 6: Final answer
    x = 63,043.92

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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.