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Finding the Fourth Proportional to 403,921.10, 605,881.65 and 137,657.90

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Solution

The fourth proportional to 403,921.10, 605,881.65 and 137,657.90 is: 206,486.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,921.10 : 605,881.65 = 137,657.90 : x
  2. Step 2: Convert to fraction form
    403,921.10/605,881.65 = 137,657.90/x
  3. Step 3: Cross multiply
    403,921.10x = 605,881.65 × 137,657.90
  4. Step 4: Simplify right side
    403,921.10x = 83,404,395,587.54
  5. Step 5: Solve for x
    x = 83,404,395,587.54/403,921.10
  6. Step 6: Final answer
    x = 206,486.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.