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Finding the Fourth Proportional to 403,391.80, 605,087.70 and 340,406.20

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Solution

The fourth proportional to 403,391.80, 605,087.70 and 340,406.20 is: 510,609.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,391.80 : 605,087.70 = 340,406.20 : x
  2. Step 2: Convert to fraction form
    403,391.80/605,087.70 = 340,406.20/x
  3. Step 3: Cross multiply
    403,391.80x = 605,087.70 × 340,406.20
  4. Step 4: Simplify right side
    403,391.80x = 205,975,604,623.74
  5. Step 5: Solve for x
    x = 205,975,604,623.74/403,391.80
  6. Step 6: Final answer
    x = 510,609.30

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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.