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Finding the Fourth Proportional to 143,415.20, 215,122.80 and 103,786.40

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Solution

The fourth proportional to 143,415.20, 215,122.80 and 103,786.40 is: 155,679.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,415.20 : 215,122.80 = 103,786.40 : x
  2. Step 2: Convert to fraction form
    143,415.20/215,122.80 = 103,786.40/x
  3. Step 3: Cross multiply
    143,415.20x = 215,122.80 × 103,786.40
  4. Step 4: Simplify right side
    143,415.20x = 22,326,820,969.92
  5. Step 5: Solve for x
    x = 22,326,820,969.92/143,415.20
  6. Step 6: Final answer
    x = 155,679.60

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1.5x scale

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.