Home / 129,028.12-178,056.18-72,439.48

Finding the Fourth Proportional to 129,028.12, 178,056.18 and 72,439.48

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Solution

The fourth proportional to 129,028.12, 178,056.18 and 72,439.48 is: 99,965.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,028.12 : 178,056.18 = 72,439.48 : x
  2. Step 2: Convert to fraction form
    129,028.12/178,056.18 = 72,439.48/x
  3. Step 3: Cross multiply
    129,028.12x = 178,056.18 × 72,439.48
  4. Step 4: Simplify right side
    129,028.12x = 12,898,297,089.99
  5. Step 5: Solve for x
    x = 12,898,297,089.99/129,028.12
  6. Step 6: Final answer
    x = 99,965.01

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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.