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Finding the Fourth Proportional to 305,359.95, 421,399.26 and 169,402.80

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Solution

The fourth proportional to 305,359.95, 421,399.26 and 169,402.80 is: 233,777.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,359.95 : 421,399.26 = 169,402.80 : x
  2. Step 2: Convert to fraction form
    305,359.95/421,399.26 = 169,402.80/x
  3. Step 3: Cross multiply
    305,359.95x = 421,399.26 × 169,402.80
  4. Step 4: Simplify right side
    305,359.95x = 71,386,214,561.93
  5. Step 5: Solve for x
    x = 71,386,214,561.93/305,359.95
  6. Step 6: Final answer
    x = 233,777.27

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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.