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Finding the Fourth Proportional to 400,911.98, 553,258.70 and 219,630.47

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Solution

The fourth proportional to 400,911.98, 553,258.70 and 219,630.47 is: 303,090.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    400,911.98 : 553,258.70 = 219,630.47 : x
  2. Step 2: Convert to fraction form
    400,911.98/553,258.70 = 219,630.47/x
  3. Step 3: Cross multiply
    400,911.98x = 553,258.70 × 219,630.47
  4. Step 4: Simplify right side
    400,911.98x = 121,512,464,448.14
  5. Step 5: Solve for x
    x = 121,512,464,448.14/400,911.98
  6. Step 6: Final answer
    x = 303,090.13

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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.