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Finding the Fourth Proportional to 129,343.84, 178,484.85 and 72,744.28

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Solution

The fourth proportional to 129,343.84, 178,484.85 and 72,744.28 is: 100,381.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,343.84 : 178,484.85 = 72,744.28 : x
  2. Step 2: Convert to fraction form
    129,343.84/178,484.85 = 72,744.28/x
  3. Step 3: Cross multiply
    129,343.84x = 178,484.85 × 72,744.28
  4. Step 4: Simplify right side
    129,343.84x = 12,983,751,904.16
  5. Step 5: Solve for x
    x = 12,983,751,904.16/129,343.84
  6. Step 6: Final answer
    x = 100,381.68

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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.