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Finding the Fourth Proportional to 393,046.99, 542,424.09 and 221,019.12

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Solution

The fourth proportional to 393,046.99, 542,424.09 and 221,019.12 is: 305,017.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,046.99 : 542,424.09 = 221,019.12 : x
  2. Step 2: Convert to fraction form
    393,046.99/542,424.09 = 221,019.12/x
  3. Step 3: Cross multiply
    393,046.99x = 542,424.09 × 221,019.12
  4. Step 4: Simplify right side
    393,046.99x = 119,886,095,038.60
  5. Step 5: Solve for x
    x = 119,886,095,038.60/393,046.99
  6. Step 6: Final answer
    x = 305,017.21

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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.