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Finding the Fourth Proportional to 315,688.68, 435,662.09 and 172,449.69

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Solution

The fourth proportional to 315,688.68, 435,662.09 and 172,449.69 is: 237,986.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,688.68 : 435,662.09 = 172,449.69 : x
  2. Step 2: Convert to fraction form
    315,688.68/435,662.09 = 172,449.69/x
  3. Step 3: Cross multiply
    315,688.68x = 435,662.09 × 172,449.69
  4. Step 4: Simplify right side
    315,688.68x = 75,129,791,503.00
  5. Step 5: Solve for x
    x = 75,129,791,503.00/315,688.68
  6. Step 6: Final answer
    x = 237,986.97

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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.