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Finding the Fourth Proportional to 143,808.66, 198,508.05 and 87,218.82

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Solution

The fourth proportional to 143,808.66, 198,508.05 and 87,218.82 is: 120,393.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,808.66 : 198,508.05 = 87,218.82 : x
  2. Step 2: Convert to fraction form
    143,808.66/198,508.05 = 87,218.82/x
  3. Step 3: Cross multiply
    143,808.66x = 198,508.05 × 87,218.82
  4. Step 4: Simplify right side
    143,808.66x = 17,313,637,881.50
  5. Step 5: Solve for x
    x = 17,313,637,881.50/143,808.66
  6. Step 6: Final answer
    x = 120,393.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.