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Finding the Fourth Proportional to 287,585.76, 431,379.75 and 87,905.37

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Solution

The fourth proportional to 287,585.76, 431,379.75 and 87,905.37 is: 131,858.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,585.76 : 431,379.75 = 87,905.37 : x
  2. Step 2: Convert to fraction form
    287,585.76/431,379.75 = 87,905.37/x
  3. Step 3: Cross multiply
    287,585.76x = 431,379.75 × 87,905.37
  4. Step 4: Simplify right side
    287,585.76x = 37,920,596,534.26
  5. Step 5: Solve for x
    x = 37,920,596,534.26/287,585.76
  6. Step 6: Final answer
    x = 131,858.39

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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.