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Finding the Fourth Proportional to 129,486.66, 178,695.09 and 72,900.06

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Solution

The fourth proportional to 129,486.66, 178,695.09 and 72,900.06 is: 100,604.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,486.66 : 178,695.09 = 72,900.06 : x
  2. Step 2: Convert to fraction form
    129,486.66/178,695.09 = 72,900.06/x
  3. Step 3: Cross multiply
    129,486.66x = 178,695.09 × 72,900.06
  4. Step 4: Simplify right side
    129,486.66x = 13,026,882,782.71
  5. Step 5: Solve for x
    x = 13,026,882,782.71/129,486.66
  6. Step 6: Final answer
    x = 100,604.05

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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.