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Finding the Fourth Proportional to 287,112.40, 430,760.40 and 87,470.80

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Solution

The fourth proportional to 287,112.40, 430,760.40 and 87,470.80 is: 131,234.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,112.40 : 430,760.40 = 87,470.80 : x
  2. Step 2: Convert to fraction form
    287,112.40/430,760.40 = 87,470.80/x
  3. Step 3: Cross multiply
    287,112.40x = 430,760.40 × 87,470.80
  4. Step 4: Simplify right side
    287,112.40x = 37,678,956,796.32
  5. Step 5: Solve for x
    x = 37,678,956,796.32/287,112.40
  6. Step 6: Final answer
    x = 131,234.17

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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.