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Finding the Fourth Proportional to 99,998.48, 138,006.43 and 56,991.12

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Solution

The fourth proportional to 99,998.48, 138,006.43 and 56,991.12 is: 78,652.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,998.48 : 138,006.43 = 56,991.12 : x
  2. Step 2: Convert to fraction form
    99,998.48/138,006.43 = 56,991.12/x
  3. Step 3: Cross multiply
    99,998.48x = 138,006.43 × 56,991.12
  4. Step 4: Simplify right side
    99,998.48x = 7,865,140,870.42
  5. Step 5: Solve for x
    x = 7,865,140,870.42/99,998.48
  6. Step 6: Final answer
    x = 78,652.61

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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.