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Finding the Fourth Proportional to 79,114.88, 109,181.54 and 45,128.90

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Solution

The fourth proportional to 79,114.88, 109,181.54 and 45,128.90 is: 62,279.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,114.88 : 109,181.54 = 45,128.90 : x
  2. Step 2: Convert to fraction form
    79,114.88/109,181.54 = 45,128.90/x
  3. Step 3: Cross multiply
    79,114.88x = 109,181.54 × 45,128.90
  4. Step 4: Simplify right side
    79,114.88x = 4,927,242,800.51
  5. Step 5: Solve for x
    x = 4,927,242,800.51/79,114.88
  6. Step 6: Final answer
    x = 62,279.60

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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.