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Finding the Fourth Proportional to 287,147.40, 430,812.90 and 87,505.80

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Solution

The fourth proportional to 287,147.40, 430,812.90 and 87,505.80 is: 131,286.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,147.40 : 430,812.90 = 87,505.80 : x
  2. Step 2: Convert to fraction form
    287,147.40/430,812.90 = 87,505.80/x
  3. Step 3: Cross multiply
    287,147.40x = 430,812.90 × 87,505.80
  4. Step 4: Simplify right side
    287,147.40x = 37,698,627,464.82
  5. Step 5: Solve for x
    x = 37,698,627,464.82/287,147.40
  6. Step 6: Final answer
    x = 131,286.68

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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.