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Finding the Fourth Proportional to 287,145.89, 430,703.10 and 87,449.55

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Solution

The fourth proportional to 287,145.89, 430,703.10 and 87,449.55 is: 131,169.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,145.89 : 430,703.10 = 87,449.55 : x
  2. Step 2: Convert to fraction form
    287,145.89/430,703.10 = 87,449.55/x
  3. Step 3: Cross multiply
    287,145.89x = 430,703.10 × 87,449.55
  4. Step 4: Simplify right side
    287,145.89x = 37,664,792,278.61
  5. Step 5: Solve for x
    x = 37,664,792,278.61/287,145.89
  6. Step 6: Final answer
    x = 131,169.54

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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.