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Finding the Fourth Proportional to 143,998.90, 215,998.35 and 81,790.90

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Solution

The fourth proportional to 143,998.90, 215,998.35 and 81,790.90 is: 122,686.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,998.90 : 215,998.35 = 81,790.90 : x
  2. Step 2: Convert to fraction form
    143,998.90/215,998.35 = 81,790.90/x
  3. Step 3: Cross multiply
    143,998.90x = 215,998.35 × 81,790.90
  4. Step 4: Simplify right side
    143,998.90x = 17,666,699,445.02
  5. Step 5: Solve for x
    x = 17,666,699,445.02/143,998.90
  6. Step 6: Final answer
    x = 122,686.35

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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.