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Finding the Fourth Proportional to 310,426.41, 428,423.97 and 172,619.09

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Solution

The fourth proportional to 310,426.41, 428,423.97 and 172,619.09 is: 238,234.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,426.41 : 428,423.97 = 172,619.09 : x
  2. Step 2: Convert to fraction form
    310,426.41/428,423.97 = 172,619.09/x
  3. Step 3: Cross multiply
    310,426.41x = 428,423.97 × 172,619.09
  4. Step 4: Simplify right side
    310,426.41x = 73,954,157,386.28
  5. Step 5: Solve for x
    x = 73,954,157,386.28/310,426.41
  6. Step 6: Final answer
    x = 238,234.10

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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.