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Finding the Fourth Proportional to 399,246.80, 599,561.40 and 386,805.20

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Solution

The fourth proportional to 399,246.80, 599,561.40 and 386,805.20 is: 580,877.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,246.80 : 599,561.40 = 386,805.20 : x
  2. Step 2: Convert to fraction form
    399,246.80/599,561.40 = 386,805.20/x
  3. Step 3: Cross multiply
    399,246.80x = 599,561.40 × 386,805.20
  4. Step 4: Simplify right side
    399,246.80x = 231,913,467,239.28
  5. Step 5: Solve for x
    x = 231,913,467,239.28/399,246.80
  6. Step 6: Final answer
    x = 580,877.46

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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.