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Finding the Fourth Proportional to 287,112.64, 430,620.72 and 87,384.64

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Solution

The fourth proportional to 287,112.64, 430,620.72 and 87,384.64 is: 131,062.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,112.64 : 430,620.72 = 87,384.64 : x
  2. Step 2: Convert to fraction form
    287,112.64/430,620.72 = 87,384.64/x
  3. Step 3: Cross multiply
    287,112.64x = 430,620.72 × 87,384.64
  4. Step 4: Simplify right side
    287,112.64x = 37,629,636,593.74
  5. Step 5: Solve for x
    x = 37,629,636,593.74/287,112.64
  6. Step 6: Final answer
    x = 131,062.28

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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.