Home / 143,905.60-215,566.80-81,503.20

Finding the Fourth Proportional to 143,905.60, 215,566.80 and 81,503.20

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Solution

The fourth proportional to 143,905.60, 215,566.80 and 81,503.20 is: 122,089.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,905.60 : 215,566.80 = 81,503.20 : x
  2. Step 2: Convert to fraction form
    143,905.60/215,566.80 = 81,503.20/x
  3. Step 3: Cross multiply
    143,905.60x = 215,566.80 × 81,503.20
  4. Step 4: Simplify right side
    143,905.60x = 17,569,384,013.76
  5. Step 5: Solve for x
    x = 17,569,384,013.76/143,905.60
  6. Step 6: Final answer
    x = 122,089.65

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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.