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Finding the Fourth Proportional to 78,991.55, 109,008.36 and 43,181.54

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Solution

The fourth proportional to 78,991.55, 109,008.36 and 43,181.54 is: 59,590.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,991.55 : 109,008.36 = 43,181.54 : x
  2. Step 2: Convert to fraction form
    78,991.55/109,008.36 = 43,181.54/x
  3. Step 3: Cross multiply
    78,991.55x = 109,008.36 × 43,181.54
  4. Step 4: Simplify right side
    78,991.55x = 4,707,148,312.63
  5. Step 5: Solve for x
    x = 4,707,148,312.63/78,991.55
  6. Step 6: Final answer
    x = 59,590.53

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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.