Home / 129,810.12-179,140.30-76,133.88

Finding the Fourth Proportional to 129,810.12, 179,140.30 and 76,133.88

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Solution

The fourth proportional to 129,810.12, 179,140.30 and 76,133.88 is: 105,066.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,810.12 : 179,140.30 = 76,133.88 : x
  2. Step 2: Convert to fraction form
    129,810.12/179,140.30 = 76,133.88/x
  3. Step 3: Cross multiply
    129,810.12x = 179,140.30 × 76,133.88
  4. Step 4: Simplify right side
    129,810.12x = 13,638,646,103.36
  5. Step 5: Solve for x
    x = 13,638,646,103.36/129,810.12
  6. Step 6: Final answer
    x = 105,066.12

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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.