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Finding the Fourth Proportional to 400,879.17, 553,189.64 and 219,555

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Solution

The fourth proportional to 400,879.17, 553,189.64 and 219,555 is: 302,972.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    400,879.17 : 553,189.64 = 219,555 : x
  2. Step 2: Convert to fraction form
    400,879.17/553,189.64 = 219,555/x
  3. Step 3: Cross multiply
    400,879.17x = 553,189.64 × 219,555
  4. Step 4: Simplify right side
    400,879.17x = 121,455,550,312.43
  5. Step 5: Solve for x
    x = 121,455,550,312.43/400,879.17
  6. Step 6: Final answer
    x = 302,972.96

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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.