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Finding the Fourth Proportional to 385,616.40, 578,424.60 and 326,713.20

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Solution

The fourth proportional to 385,616.40, 578,424.60 and 326,713.20 is: 490,069.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,616.40 : 578,424.60 = 326,713.20 : x
  2. Step 2: Convert to fraction form
    385,616.40/578,424.60 = 326,713.20/x
  3. Step 3: Cross multiply
    385,616.40x = 578,424.60 × 326,713.20
  4. Step 4: Simplify right side
    385,616.40x = 188,978,952,024.72
  5. Step 5: Solve for x
    x = 188,978,952,024.72/385,616.40
  6. Step 6: Final answer
    x = 490,069.80

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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.