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Finding the Fourth Proportional to 79,678.88, 109,963.20 and 45,690.48

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Solution

The fourth proportional to 79,678.88, 109,963.20 and 45,690.48 is: 63,056.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,678.88 : 109,963.20 = 45,690.48 : x
  2. Step 2: Convert to fraction form
    79,678.88/109,963.20 = 45,690.48/x
  3. Step 3: Cross multiply
    79,678.88x = 109,963.20 × 45,690.48
  4. Step 4: Simplify right side
    79,678.88x = 5,024,271,390.34
  5. Step 5: Solve for x
    x = 5,024,271,390.34/79,678.88
  6. Step 6: Final answer
    x = 63,056.50

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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.