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Finding the Fourth Proportional to 279,988.60, 420,420.30 and 161,890.60

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Solution

The fourth proportional to 279,988.60, 420,420.30 and 161,890.60 is: 243,088.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,988.60 : 420,420.30 = 161,890.60 : x
  2. Step 2: Convert to fraction form
    279,988.60/420,420.30 = 161,890.60/x
  3. Step 3: Cross multiply
    279,988.60x = 420,420.30 × 161,890.60
  4. Step 4: Simplify right side
    279,988.60x = 68,062,094,619.18
  5. Step 5: Solve for x
    x = 68,062,094,619.18/279,988.60
  6. Step 6: Final answer
    x = 243,088.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.