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Finding the Fourth Proportional to 309,147.84, 426,640 and 173,173.84

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Solution

The fourth proportional to 309,147.84, 426,640 and 173,173.84 is: 238,988.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,147.84 : 426,640 = 173,173.84 : x
  2. Step 2: Convert to fraction form
    309,147.84/426,640 = 173,173.84/x
  3. Step 3: Cross multiply
    309,147.84x = 426,640 × 173,173.84
  4. Step 4: Simplify right side
    309,147.84x = 73,882,887,097.60
  5. Step 5: Solve for x
    x = 73,882,887,097.60/309,147.84
  6. Step 6: Final answer
    x = 238,988.85

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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.