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Finding the Fourth Proportional to 438,912.20, 658,368.30 and 261,619.40

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Solution

The fourth proportional to 438,912.20, 658,368.30 and 261,619.40 is: 392,429.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,912.20 : 658,368.30 = 261,619.40 : x
  2. Step 2: Convert to fraction form
    438,912.20/658,368.30 = 261,619.40/x
  3. Step 3: Cross multiply
    438,912.20x = 658,368.30 × 261,619.40
  4. Step 4: Simplify right side
    438,912.20x = 172,241,919,625.02
  5. Step 5: Solve for x
    x = 172,241,919,625.02/438,912.20
  6. Step 6: Final answer
    x = 392,429.10

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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.