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Finding the Fourth Proportional to 129,344.84, 178,486.23 and 72,745.28

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Solution

The fourth proportional to 129,344.84, 178,486.23 and 72,745.28 is: 100,383.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,344.84 : 178,486.23 = 72,745.28 : x
  2. Step 2: Convert to fraction form
    129,344.84/178,486.23 = 72,745.28/x
  3. Step 3: Cross multiply
    129,344.84x = 178,486.23 × 72,745.28
  4. Step 4: Simplify right side
    129,344.84x = 12,984,030,777.49
  5. Step 5: Solve for x
    x = 12,984,030,777.49/129,344.84
  6. Step 6: Final answer
    x = 100,383.06

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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.