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Finding the Fourth Proportional to 287,069.84, 430,629.05 and 87,391.88

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Solution

The fourth proportional to 287,069.84, 430,629.05 and 87,391.88 is: 131,095.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,069.84 : 430,629.05 = 87,391.88 : x
  2. Step 2: Convert to fraction form
    287,069.84/430,629.05 = 87,391.88/x
  3. Step 3: Cross multiply
    287,069.84x = 430,629.05 × 87,391.88
  4. Step 4: Simplify right side
    287,069.84x = 37,633,480,327.45
  5. Step 5: Solve for x
    x = 37,633,480,327.45/287,069.84
  6. Step 6: Final answer
    x = 131,095.21

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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.