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Finding the Fourth Proportional to 418,672.70, 628,009.05 and 399,427.10

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Solution

The fourth proportional to 418,672.70, 628,009.05 and 399,427.10 is: 599,140.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,672.70 : 628,009.05 = 399,427.10 : x
  2. Step 2: Convert to fraction form
    418,672.70/628,009.05 = 399,427.10/x
  3. Step 3: Cross multiply
    418,672.70x = 628,009.05 × 399,427.10
  4. Step 4: Simplify right side
    418,672.70x = 250,843,833,615.26
  5. Step 5: Solve for x
    x = 250,843,833,615.26/418,672.70
  6. Step 6: Final answer
    x = 599,140.65

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.