Home / 143,409.19-197,909.48-78,881.15

Finding the Fourth Proportional to 143,409.19, 197,909.48 and 78,881.15

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Solution

The fourth proportional to 143,409.19, 197,909.48 and 78,881.15 is: 108,858.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,409.19 : 197,909.48 = 78,881.15 : x
  2. Step 2: Convert to fraction form
    143,409.19/197,909.48 = 78,881.15/x
  3. Step 3: Cross multiply
    143,409.19x = 197,909.48 × 78,881.15
  4. Step 4: Simplify right side
    143,409.19x = 15,611,327,378.30
  5. Step 5: Solve for x
    x = 15,611,327,378.30/143,409.19
  6. Step 6: Final answer
    x = 108,858.63

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1.5x scale

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.