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Finding the Fourth Proportional to 401,109.60, 553,384.80 and 239,969.28

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Solution

The fourth proportional to 401,109.60, 553,384.80 and 239,969.28 is: 331,069.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    401,109.60 : 553,384.80 = 239,969.28 : x
  2. Step 2: Convert to fraction form
    401,109.60/553,384.80 = 239,969.28/x
  3. Step 3: Cross multiply
    401,109.60x = 553,384.80 × 239,969.28
  4. Step 4: Simplify right side
    401,109.60x = 132,795,352,018.94
  5. Step 5: Solve for x
    x = 132,795,352,018.94/401,109.60
  6. Step 6: Final answer
    x = 331,069.99

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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.