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Finding the Fourth Proportional to 402,408.20, 603,612.30 and 260,690.60

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Solution

The fourth proportional to 402,408.20, 603,612.30 and 260,690.60 is: 391,035.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,408.20 : 603,612.30 = 260,690.60 : x
  2. Step 2: Convert to fraction form
    402,408.20/603,612.30 = 260,690.60/x
  3. Step 3: Cross multiply
    402,408.20x = 603,612.30 × 260,690.60
  4. Step 4: Simplify right side
    402,408.20x = 157,356,052,654.38
  5. Step 5: Solve for x
    x = 157,356,052,654.38/402,408.20
  6. Step 6: Final answer
    x = 391,035.90

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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.