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Finding the Fourth Proportional to 279,405.21, 385,568.48 and 158,539.28

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Solution

The fourth proportional to 279,405.21, 385,568.48 and 158,539.28 is: 218,778.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,405.21 : 385,568.48 = 158,539.28 : x
  2. Step 2: Convert to fraction form
    279,405.21/385,568.48 = 158,539.28/x
  3. Step 3: Cross multiply
    279,405.21x = 385,568.48 × 158,539.28
  4. Step 4: Simplify right side
    279,405.21x = 61,127,746,489.36
  5. Step 5: Solve for x
    x = 61,127,746,489.36/279,405.21
  6. Step 6: Final answer
    x = 218,778.12

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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.