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Finding the Fourth Proportional to 421,209.48, 581,268.96 and 239,938.20

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Solution

The fourth proportional to 421,209.48, 581,268.96 and 239,938.20 is: 331,114.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,209.48 : 581,268.96 = 239,938.20 : x
  2. Step 2: Convert to fraction form
    421,209.48/581,268.96 = 239,938.20/x
  3. Step 3: Cross multiply
    421,209.48x = 581,268.96 × 239,938.20
  4. Step 4: Simplify right side
    421,209.48x = 139,468,627,978.27
  5. Step 5: Solve for x
    x = 139,468,627,978.27/421,209.48
  6. Step 6: Final answer
    x = 331,114.65

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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.