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Finding the Fourth Proportional to 393,351.75, 542,873.42 and 221,276.93

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Solution

The fourth proportional to 393,351.75, 542,873.42 and 221,276.93 is: 305,389.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,351.75 : 542,873.42 = 221,276.93 : x
  2. Step 2: Convert to fraction form
    393,351.75/542,873.42 = 221,276.93/x
  3. Step 3: Cross multiply
    393,351.75x = 542,873.42 × 221,276.93
  4. Step 4: Simplify right side
    393,351.75x = 120,125,359,935.45
  5. Step 5: Solve for x
    x = 120,125,359,935.45/393,351.75
  6. Step 6: Final answer
    x = 305,389.16

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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.