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Finding the Fourth Proportional to 403,618.40, 605,427.60 and 360,072.80

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Solution

The fourth proportional to 403,618.40, 605,427.60 and 360,072.80 is: 540,109.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,618.40 : 605,427.60 = 360,072.80 : x
  2. Step 2: Convert to fraction form
    403,618.40/605,427.60 = 360,072.80/x
  3. Step 3: Cross multiply
    403,618.40x = 605,427.60 × 360,072.80
  4. Step 4: Simplify right side
    403,618.40x = 217,998,011,129.28
  5. Step 5: Solve for x
    x = 217,998,011,129.28/403,618.40
  6. Step 6: Final answer
    x = 540,109.20

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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.