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Finding the Fourth Proportional to 143,963.40, 215,945.12 and 77,311.84

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Solution

The fourth proportional to 143,963.40, 215,945.12 and 77,311.84 is: 115,967.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,963.40 : 215,945.12 = 77,311.84 : x
  2. Step 2: Convert to fraction form
    143,963.40/215,945.12 = 77,311.84/x
  3. Step 3: Cross multiply
    143,963.40x = 215,945.12 × 77,311.84
  4. Step 4: Simplify right side
    143,963.40x = 16,695,114,566.22
  5. Step 5: Solve for x
    x = 16,695,114,566.22/143,963.40
  6. Step 6: Final answer
    x = 115,967.77

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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.