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Finding the Fourth Proportional to 386,435.40, 579,653.10 and 266,166.60

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Solution

The fourth proportional to 386,435.40, 579,653.10 and 266,166.60 is: 399,249.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,435.40 : 579,653.10 = 266,166.60 : x
  2. Step 2: Convert to fraction form
    386,435.40/579,653.10 = 266,166.60/x
  3. Step 3: Cross multiply
    386,435.40x = 579,653.10 × 266,166.60
  4. Step 4: Simplify right side
    386,435.40x = 154,284,294,806.46
  5. Step 5: Solve for x
    x = 154,284,294,806.46/386,435.40
  6. Step 6: Final answer
    x = 399,249.90

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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.