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Finding the Fourth Proportional to 483,886.40, 724,447.20 and 428,590.40

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Solution

The fourth proportional to 483,886.40, 724,447.20 and 428,590.40 is: 641,661.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    483,886.40 : 724,447.20 = 428,590.40 : x
  2. Step 2: Convert to fraction form
    483,886.40/724,447.20 = 428,590.40/x
  3. Step 3: Cross multiply
    483,886.40x = 724,447.20 × 428,590.40
  4. Step 4: Simplify right side
    483,886.40x = 310,491,115,226.88
  5. Step 5: Solve for x
    x = 310,491,115,226.88/483,886.40
  6. Step 6: Final answer
    x = 641,661.17

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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.