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Finding the Fourth Proportional to 103,645.84, 143,100.12 and 79,730.32

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Solution

The fourth proportional to 103,645.84, 143,100.12 and 79,730.32 is: 110,080.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,645.84 : 143,100.12 = 79,730.32 : x
  2. Step 2: Convert to fraction form
    103,645.84/143,100.12 = 79,730.32/x
  3. Step 3: Cross multiply
    103,645.84x = 143,100.12 × 79,730.32
  4. Step 4: Simplify right side
    103,645.84x = 11,409,418,359.64
  5. Step 5: Solve for x
    x = 11,409,418,359.64/103,645.84
  6. Step 6: Final answer
    x = 110,080.81

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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.