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Finding the Fourth Proportional to 805,408.40, 1,208,458.20 and 411,424.40

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Solution

The fourth proportional to 805,408.40, 1,208,458.20 and 411,424.40 is: 617,313.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    805,408.40 : 1,208,458.20 = 411,424.40 : x
  2. Step 2: Convert to fraction form
    805,408.40/1,208,458.20 = 411,424.40/x
  3. Step 3: Cross multiply
    805,408.40x = 1,208,458.20 × 411,424.40
  4. Step 4: Simplify right side
    805,408.40x = 497,189,189,860.08
  5. Step 5: Solve for x
    x = 497,189,189,860.08/805,408.40
  6. Step 6: Final answer
    x = 617,313.14

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1.5x scale

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.