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Finding the Fourth Proportional to 287,040.87, 430,583.31 and 87,378.30

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Solution

The fourth proportional to 287,040.87, 430,583.31 and 87,378.30 is: 131,074.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,040.87 : 430,583.31 = 87,378.30 : x
  2. Step 2: Convert to fraction form
    287,040.87/430,583.31 = 87,378.30/x
  3. Step 3: Cross multiply
    287,040.87x = 430,583.31 × 87,378.30
  4. Step 4: Simplify right side
    287,040.87x = 37,623,637,636.17
  5. Step 5: Solve for x
    x = 37,623,637,636.17/287,040.87
  6. Step 6: Final answer
    x = 131,074.15

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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.