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Finding the Fourth Proportional to 282,388.40, 389,670.60 and 155,061.20

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Solution

The fourth proportional to 282,388.40, 389,670.60 and 155,061.20 is: 213,970.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    282,388.40 : 389,670.60 = 155,061.20 : x
  2. Step 2: Convert to fraction form
    282,388.40/389,670.60 = 155,061.20/x
  3. Step 3: Cross multiply
    282,388.40x = 389,670.60 × 155,061.20
  4. Step 4: Simplify right side
    282,388.40x = 60,422,790,840.72
  5. Step 5: Solve for x
    x = 60,422,790,840.72/282,388.40
  6. Step 6: Final answer
    x = 213,970.51

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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.