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Finding the Fourth Proportional to 393,391.36, 542,874.24 and 221,296.32

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Solution

The fourth proportional to 393,391.36, 542,874.24 and 221,296.32 is: 305,385.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,391.36 : 542,874.24 = 221,296.32 : x
  2. Step 2: Convert to fraction form
    393,391.36/542,874.24 = 221,296.32/x
  3. Step 3: Cross multiply
    393,391.36x = 542,874.24 × 221,296.32
  4. Step 4: Simplify right side
    393,391.36x = 120,136,071,534.80
  5. Step 5: Solve for x
    x = 120,136,071,534.80/393,391.36
  6. Step 6: Final answer
    x = 305,385.64

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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.