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Finding the Fourth Proportional to 287,279.10, 430,918.65 and 259,722.90

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Solution

The fourth proportional to 287,279.10, 430,918.65 and 259,722.90 is: 389,584.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,279.10 : 430,918.65 = 259,722.90 : x
  2. Step 2: Convert to fraction form
    287,279.10/430,918.65 = 259,722.90/x
  3. Step 3: Cross multiply
    287,279.10x = 430,918.65 × 259,722.90
  4. Step 4: Simplify right side
    287,279.10x = 111,919,441,442.09
  5. Step 5: Solve for x
    x = 111,919,441,442.09/287,279.10
  6. Step 6: Final answer
    x = 389,584.35

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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.