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Finding the Fourth Proportional to 143,409.60, 215,114.40 and 87,422.40

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Solution

The fourth proportional to 143,409.60, 215,114.40 and 87,422.40 is: 131,133.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,409.60 : 215,114.40 = 87,422.40 : x
  2. Step 2: Convert to fraction form
    143,409.60/215,114.40 = 87,422.40/x
  3. Step 3: Cross multiply
    143,409.60x = 215,114.40 × 87,422.40
  4. Step 4: Simplify right side
    143,409.60x = 18,805,817,122.56
  5. Step 5: Solve for x
    x = 18,805,817,122.56/143,409.60
  6. Step 6: Final answer
    x = 131,133.60

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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.